Malrotation with volvulus

• Intestinal malrotation is a congenital rotation and fixation error of the midgut. It occurs in roughly 1 in 500 live births, yet only a minority become symptomatic (about 1 in 6,000 people). ^{[3] [6] [7]}
• The danger is midgut volvulus: the bowel twists on a shortened mesenteric pedicle around the superior mesenteric artery, cutting off blood supply. This is a surgical emergency. ^{[3] [6]}
• In a neonate the classic warning is sudden bilious (green) vomiting, often with abdominal distension and rapid deterioration. ^{[2] [3] [7]}
• The gold-standard imaging test in a stable child is an upper gastrointestinal (UGI) contrast study, looking for an abnormally placed duodenojejunal junction and a "corkscrew" duodenum. ^{[2] [4]}
• The definitive operation is the Ladd procedure: untwist any volvulus, divide Ladd (peritoneal) bands, broaden the mesentery, reposition the bowel (small bowel right, colon left) and usually remove the appendix. ^{[4] [7]}

By the end of this page you should be able to:

1. Describe normal intestinal rotation in the embryo and the two ways it can fail.
2. Explain what Ladd bands are and why a malrotated gut has a narrow mesentery.
3. Recognise bilious vomiting in a neonate as a possible midgut volvulus and state the first steps in management.
4. Choose and interpret the appropriate imaging study (UGI, ultrasound, plain film, CT).
5. Outline the Ladd procedure and the reason it does not restore "normal" anatomy.
6. Explain how midgut volvulus leads to ischaemia, short bowel syndrome and death, and what affects recovery.

Malrotation is not a disease of the bowel wall; it is a disease of position and fixation. The midgut, which gives rise to most of the small intestine and part of the colon, is supplied by the superior mesenteric artery (SMA). In a healthy fetus it rotates and fixes in a way that leaves the duodenum posterior and to the left, the colon framing it, and the mesentery spread wide. In malrotation that journey stops too soon. The duodenum sits too far right, the caecum (and usually the appendix) sits too high and central, the mesenteric root between them is short, and fibrous peritoneal bands (Ladd bands) can cross and compress the duodenum. The foreshortened mesentery can then twist into a volvulus around the SMA, dragging the whole midgut with it. That is what makes malrotation dangerous: a bowel, even a morphologically normal bowel, becomes acutely ischemic within hours.

The condition has two faces. Most people with malrotation never know they have it: the malposition is found incidentally at imaging or at an operation for something else, and the mesentery may never twist. A minority present catastrophically, usually in the first weeks of life, with bilious vomiting and a midgut volvulus that can progress to transmural necrosis. The job of the clinician is to hold both faces in mind: do not miss the emergency, and do not subject every incidental finding to an operation without thought. ^[1][3]

Malrotation is not one condition but a spectrum, determined by how far and in which direction rotation stopped. ^{[4] [1]}

• Non-rotation. Neither the upper (pre-arterial, duodenojejunal) nor the lower (post-arterial, caecocolic) loop rotates more than about 90°. The small bowel ends up on the right, the colon on the left, and the mesentery is very narrow. This is the pattern most prone to volvulus.
• Incomplete rotation. Both loops stop before reaching 180° of rotation. The proximal midgut fixes to the right of the SMA and the caecum fixes directly anterior to it. This pattern carries the classic Ladd bands across the duodenum and a narrow, foreshortened mesenteric root.
• Reverse rotation and atypical patterns. Less common variants in which rotation occurs in the wrong direction.

All share the same hazardous anatomy: a duodenum and caecum fixed close to the SMA, a short mesenteric pedicle, and (often) fibrous Ladd bands.

Malrotation is a reasonably common congenital anomaly but a rare clinical disease. ^{[3] [6] [1]}

• Incidence. Approximately 1 in 500 live births. ^{[3] [6] [7]}
• Volvulus. Associated midgut volvulus occurs in roughly 1 in 2,500 live births. ^[6]
• Symptomatic disease. Symptoms develop in about 1 in 6,000 individuals. ^[6]
• Sex and age of presentation. In most surgical series three-quarters of patients are male. ^[1] About 75% of symptomatic cases occur in neonates, and up to 90% occur within the first year of life. ^[3] Around 80% of symptomatic patients present in the neonatal period, most often in the first week. ^[2]
• Overall prevalence in the population. Malrotation is present in roughly 0.2% to 1% of people. ^[1]
• Mortality. Neonatal mortality from midgut volvulus was about 30% in the 1960s and has fallen to roughly 3% to 5% with modern surgery. ^[3]

So the paradox to keep in mind: the anomaly is common, the emergency is uncommon, and when it happens it is heavily concentrated in the first weeks of life.

The cause is not a mutation in a single gene; it is an error in the mechanical choreography of gut rotation. ^{[4] [1]} The normal rotation and fixation occur during the first trimester, and disruptions of that process produce the spectrum above. No modifiable risk factor is known. Reported associations include:

• Associated anomalies. Malrotation often accompanies other congenital problems. In one large multicentre series the commonest associated findings were annular pancreas (about 27%), duodenal web (20%) and intestinal atresia (20%), with further cases involving Meckel diverticulum, congenital heart disease, intestinal duplication and Down syndrome. ^[1]
• Heterotaxy. Children with heterotaxy syndrome (abnormal left-right organ arrangement) have a high rate of rotational anomalies; whether and when to operate on them remains debated, and any Ladd procedure in this group is usually deferred until cardiac disease is well controlled. ^[4]
• No inheritance pattern. Sporadic and, only rarely, familial cases are described. Heterotaxy is the strongest identifiable association.

Because associated anomalies are common, a baby found to have malrotation should be screened for other congenital problems, particularly cardiac and pancreatic/duodenal anomalies. ^[1]

The midgut begins as a straight tube whose blood comes mainly from the SMA, which divides it into a pre-arterial (duodenojejunal) upper portion and a post-arterial (caecocolic) lower portion. ^{[4] [6]}

• Lengthening and herniation. From about the 4th or 5th week of gestation, and certainly into the first trimester, the midgut grows faster than the abdominal cavity can hold and herniates through the umbilicus. ^{[4] [6]}
• Rotation. While herniated, the pre-arterial (upper) portion rotates about 180° counterclockwise around the SMA and the post-arterial (lower) portion about 90° counterclockwise. ^[4]
• Return and fixation. From about the 10th or 11th week the intestine returns to the abdomen, completing a total rotation of 270° counterclockwise. ^{[4] [6]} Sources describe the timing slightly differently (one gives weeks 4–5 to 10, another weeks 6 to 10), but the endpoint is the same: by the end of the first trimester the bowel has taken up its final position. ^{[4] [6] [2]}
• Why it matters. The result of this 270° rotation is that the C-loop of the duodenum lies posterior to the SMA and the transverse colon lies anterior to it, with a broad mesenteric root running from the ligament of Treitz (the duodenojejunal junction) to the caecum. ^[4]

Sources state the total rotation as 270° counterclockwise, the single most reliable number in this topic. ^{[2] [4] [6]}

In malrotation the midgut stops early, never achieves the 270° turn, and fixes badly. ^{[4] [1]}

• The mesenteric root, instead of being a broad sheet, becomes a short, narrow pedicle hanging from the SMA.
• The duodenum and caecum end up fixed close to the SMA and to each other, so a twist can take the whole midgut with it.
• When the caecum lies high and central, fibrous peritoneal (Ladd) bands run from it across the anterior duodenum to the right lateral abdominal wall. These bands can compress the duodenum and cause obstruction even without any volvulus.

Named after William Ladd, who described both the condition's operative anatomy and the procedure used to treat it, Ladd bands are the mechanical cause of duodenal obstruction in many infants with malrotation who have not (yet) volvulised. ^[4] Dividing them is one of the central steps of the Ladd procedure. ^{[4] [7]}

A volvulus is a twist of the small bowel around its mesenteric axis. In malrotation the narrow mesentery is the fixed point that makes twisting easy. ^{[3] [4]}

Once the midgut begins to twist, several things happen in sequence:

1. The duodenum and proximal small bowel are obstructed, so swallowed and secreted fluid (including bile) accumulates and is vomited.
2. Venous drainage is compressed first, because the thin-walled veins collapse before the thicker-walled arteries. The bowel becomes congested and oedematous.
3. Arterial inflow is then compromised. The mesentery twists tightly enough to occlude the SMA branches that feed the midgut.
4. Without arterial flow the bowel becomes ischemic, then haemorrhagic, then necrotic. Mucosal damage allows bleeding into the gut lumen and may produce bloody stools, a late and ominous sign.
5. Dead bowel leaks, leading to peritonitis, sepsis, shock and multiple-organ dysfunction.

The transition from reversible ischaemia to transmural necrosis takes roughly 8 to 16 hours. ^[3] That number should shape every decision in the emergency setting: imaging and surgical consultation must not be allowed to drift. Beyond that window bowel resection, with its attendant morbidity, becomes unavoidable, and the outcome depends on how much bowel is lost. ^[3]

The reason midgut volvulus kills and disables is not the twist itself but bowel loss. With a torsion of 360° or more the whole midgut, from the distal duodenum to the mid-transverse colon, can infarct. Survivors of massive resection may be left with short bowel syndrome, needing long-term parenteral nutrition, and in the worst cases intestinal transplantation. ^[6] In one multicentre surgical series, intestinal torsions of 360° in one patient and 720° in two patients produced irreversible ischemia of 30, 35 and 80 cm of intestine that had to be resected and reanastomosed. ^[1] A delayed diagnosis therefore converts a curable rotational anomaly into a chronic, life-limiting nutritional disability. ^[4]

Symptoms depend on the age, whether a volvulus has occurred, and how completely the duodenum is obstructed. ^{[1] [2] [6]}

This is the presentation every student must recognise.

• Abrupt bilious vomiting. Often sudden, repeated, green vomits (sometimes bile-stained rather than frankly green) after feeds, in a baby who was previously well. ^{[2] [3] [7]}
• Bilious vomiting in 70% to 90% of symptomatic neonatal cases. ^[6] In one surgical series, 89% of neonates with malrotation had bilious vomiting, and 63% of older children did. ^[1]
• Abdominal distension. ^{[2] [3] [6] [7]}
• Systemic deterioration. Irritability, poor feeding, jaundice, hypothermia, shock; the baby "goes off" quickly. ^{[1] [2]}
• Bloody stools or hematemesis. A late sign of mucosal ischaemia; its presence means the bowel is already at risk. ^{[1] [6]}
• Atypical presentations. Not every case looks like the textbook baby. Only 9% to 16% of episodes of bilious vomiting in term neonates are ultimately caused by malrotation, so the diagnosis must be pursued promptly but without assuming it. ^[6] In one large series more than 10% of neonates and nearly 40% of older patients presented with non-bilious vomiting instead, which can mislead. ^[1] Haematochezia as the sole sign has also been reported. ^[6]

Beyond the neonatal period the condition can smoulder:

• Intermittent or recurrent bilious or non-bilious vomiting
• Colicky abdominal pain, bloating after meals
• Failure to thrive, malnutrition, chronic anaemia ^{[1] [6]}
• Acute volvulus with the neonatal picture can still occur at any age, though it becomes less frequent with age. ^[3]

Malrotation can present in adults, usually with chronic pain, intermittent obstruction or an incidental finding. Adult small-bowel volvulus from all causes is uncommon in Western countries (about 1.7 to 5.7 cases per 100,000 adults per year) but more common in parts of Africa and Asia. ^[7] The general principle is the same: a mobile long segment on a narrow mesentery is at risk. ^[1][6]

• A soft, minimally distended abdomen in the early stage, with the baby crying and irritable. ^[2]
• Later: abdominal distension, tenderness, guarding, peritonism, absent or altered bowel sounds.
• Signs of shock: tachycardia, poor perfusion, hypotension, apnoea, altered consciousness.
• Remember that an unremarkable abdominal examination does not exclude early gangrene; normal examination, plain film, lactate, blood pressure, urine output and blood gases can all be present early. ^[2]

In a neonate with bilious vomiting the underlying cause is obstruction distal to the ampulla of Vater. Malrotation with volvulus is one of several, and the stakes of missing any of them are high. ^{[2] [3] [6]}

A key exam trap: not every baby with bilious vomiting has malrotation, but malrotation must be excluded urgently in every one of them, because the cost of a delay is measured in metres of bowel. ^{[3] [6]}

The aim is twofold: confirm or exclude malrotation, and decide whether a volvulus with ischemia is present. Which test comes first depends on how sick the baby is and on the experience and equipment available locally. ^{[2] [4] [5]}

If there is peritonitis, haemodynamic instability, gross abdominal distension with peritoneal signs, or a rapidly deteriorating baby, aggressive resuscitation followed by urgent laparotomy takes priority over completing an imaging work-up. Imaging can be done in theatre or omitted altogether. ^{[1] [7]}

Cheap, quick and available, but an unreliable test for malrotation: the most common finding is a "normal bowel gas pattern". ^[4] It can, however, show clues that push the team towards operation:

• "Double bubble" of duodenal obstruction
• Lack of distal bowel gas
• Bowel malposition (small bowel right, large bowel left, seen in non-rotation)
• Pneumatosis intestinalis or portal venous gas, suggesting necrosis

It should not be used to reassure. ^{[4] [2]}

In most paediatric practice the UGI series remains the gold-standard test for malrotation. ^{[2] [3] [4] [6]} Contrast is given by mouth or via a nasogastric tube and tracked as it passes through the oesophagus, stomach, duodenal C-loop and duodenojejunal junction (DJJ).

• What to look for. The DJJ should lie to the left of the left pedicle of the vertebral body, at the level of the duodenal bulb, and be posterior (retroperitoneal) on the lateral view. ^{[2] [4]} Findings suggesting malrotation or volvulus include a low DJJ, absence of the DJJ to the left of the vertebral body pedicle, jejunum on the right, duodenal redundancy and the DJJ "corkscrew" appearance. ^[4]
• The corkscrew sign. In midgut volvulus the duodenum is dilated with abrupt narrowing, and the twisted distal loops have a spiralling "corkscrew" (sometimes described as a "bird's beak") appearance. ^{[2] [7]}
• Abnormal position of the DJJ was found in 84% of neonates and 88% of older children with malrotation in one multicentre series. ^[1]
• Sensitivity for volvulus. The UGI is good at showing malrotation but less perfect at showing volvulus itself: published sensitivities for detecting midgut volvulus range from 54% to 87%. ^[1] A UGI reported as normal does not completely exclude a malrotation, particularly an intermittent volvulus. ^[4]
• Technique matters. Low-osmolality water-soluble contrast is preferred. ^[3] Careful positioning and an experienced paediatric radiologist are essential, and cooperation between surgeon and radiologist is the single most important factor in a good study. ^[4]
• Definition of a normal study. A normally positioned DJJ implies normal fixation of the mesenteric root and effectively rules out malrotation. Conversely, failure to demonstrate a normal DJJ warrants prompt surgical exploration. ^[3]

Traditionally the UGI is quoted as having over 90% diagnostic accuracy for suspected malrotation in neonates with bilious emesis. ^[6]

Ultrasound has moved from adjunct to potential first-line test in many centres. ^{[1] [5] [6]}

• How it diagnoses malrotation. By examining the third part of the duodenum (whether it is retroperitoneal between the aorta and SMA, as it should be) and the relationship of the SMA and SMV. Normally the SMV lies to the right and anterior (roughly 9 to 12 o'clock) of the SMA; reversal of that relationship suggests malrotation, with a sensitivity of 44% to 87% and a specificity of 98%. ^[2]
• The whirlpool sign. In volvulus, colour Doppler ultrasound shows the SMV and mesentery twisting clockwise around the SMA: direct evidence of a twist, with a sensitivity around 92% and specificity around 99% for volvulus in meta-analysis. ^[5]
• Diagnostic accuracy overall. A systematic review and meta-analysis of 17 studies (about 2,250 children) found abdominal ultrasound had a summary sensitivity of 94% (95% confidence interval 89% to 97%) and summary specificity of 100% (97% to 100%) for midgut malrotation with or without volvulus, against a reference standard. ^{[5] [1]}
• Versus UGI. In the same meta-analysis, UGI had a sensitivity of 91% (84% to 96%) and specificity of 94% (72% to 99%), a specificity significantly lower than that of ultrasound. ^[5]
• Practical advantages. Portable to the bedside, no ionising radiation, faster and cheaper: one analysis found ultrasound was on average 35 minutes faster and 127 US dollars cheaper per patient than UGI. ^[5]
• Caveats. Ultrasound is operator dependent, limited by bowel gas, and a normal study does not exclude malrotation in all hands. It should be performed or interpreted by experienced staff, and where doubt persists the UGI still has a role. ^{[2] [4] [5]}

• Contrast (barium) enema. Assesses caecal position. An abnormal caecal position is found in about 80% to 87% of surgically proven malrotation, but up to 20% of children with malrotation have a normally positioned caecum, so a normal study cannot reassure. ^[4]
• CT. Quick and can visualise the DJJ, D3 and the SMA/SMV relationship; abnormal D3 position on CT has reported sensitivity 97.3% and specificity 99% for malrotation. It also shows perfusion (whirl sign and bowel-wall changes) and is the test of choice in older children and adults. The cost is significant radiation and, in small children, the need to keep still. ^[4]
• MRI. Gives similar anatomical information without radiation but takes longer and usually needs sedation in young children; reserved for special situations. ^[4]

No blood test diagnoses malrotation. ^[1] They are used to assess the consequences: full blood count (anaemia, leukocytosis), electrolytes and acid-base (metabolic acidosis from under-perfusion), lactate (tissue hypoperfusion, but may be normal early), blood gas, glucose, group and save, and sepsis screening. Coagulation should be checked if theatre is likely. ^{[2] [1]}

• Nil by mouth. Large-bore nasogastric or orogastric tube on free drainage to decompress the stomach and duodenum. ^[2]
• Intravenous access and resuscitation. IV fluids, glucose, correction of acidosis, monitoring of urine output and perfusion. ^{[2] [7]}
• Broad-spectrum antibiotics as per local protocol (the baby may already have bacterial translocation from a compromised gut).
• Urgent paediatric surgical consultation before or in parallel with imaging. If midgut volvulus is strongly suspected, surgical review should not wait for the radiograph. ^{[3] [7]}
• Transfer to a centre with paediatric surgery if needed; keep imaging to the minimum during transport.

The Ladd procedure does not restore normal embryological rotation. It deliberately creates a broad, stable "non-rotation": small bowel on the right, colon on the left, with a wide mesenteric root and no obstructing bands. ^{[4] [7]} The steps are: ^{[4] [7]}

1. Delivery and inspection of the bowel. The intestines are brought out of the abdomen so the whole midgut can be inspected, ideally without undue manipulation before the vascular supply is assessed.
2. Counterclockwise detorsion. Any volvulus is reduced by turning the bowel counterclockwise (the reverse of the usual clockwise twist).
3. Viability assessment. Frankly necrotic segments are resected; doubtful segments are wrapped and re-inspected at a planned second-look operation rather than sacrificed in haste.
4. Division of Ladd bands. The peritoneal bands running from the malpositioned caecum across the duodenum are divided, releasing any duodenal obstruction. The superior mesenteric vessels are protected throughout. ^{[4] [7]}
5. Broadening of the mesentery. Adhesions between the root and the retroperitoneum are divided so the mesenteric base is widened, reducing the risk of recurrent volvulus.
6. Repositioning. Small intestine is placed on the right side of the abdomen and colon on the left (the "non-rotation" position), which maximises mesenteric breadth. ^{[4] [7]}
7. Appendectomy. Usually performed, because the appendix ends up in the left upper quadrant after repositioning, where future appendicitis would be missed and its blood supply may have been compromised during band division. A growing minority of surgeons now preserve the appendix, especially when it may later be needed as a conduit, because modern imaging and documentation make missed appendicitis unlikely; the safety data on this are still accumulating. ^[4]

Both approaches are used and both achieve the same anatomical result. ^{[1] [2]}

• In one multicentre series 89% of neonates had an open Ladd procedure, while nearly half of older patients had laparoscopic surgery or required conversion to open. ^[1]
• Laparoscopic Ladd may be associated with a shorter time to resuming feeds and shorter hospital stay in malrotation without volvulus, but laparoscopic neonatal Ladd has been reported to carry a higher risk of recurrent volvulus than the open operation. ^{[1] [2]}
• Conversion to open surgery after an initial laparoscopic attempt takes significantly longer than either open or laparoscopic Ladd alone. ^[1]
• In a haemodynamically unstable neonate with extensive ischemia, open surgery through a laparotomy is the standard approach. ^{[1] [7]}

• Feeding is restarted once gut function returns; in one series the mean time to initial postoperative oral feeding was 4.47 days after open Ladd and 4.50 days after laparoscopic Ladd, with no significant difference between approaches. ^[1]
• Bowel viability is the key long-term variable. Infarcted bowel is resected with primary anastomosis when the condition allows; second-look laparotomy is used when viability is uncertain at first operation, to avoid unnecessary bowel loss. ^[7]
• Recurrence can occur, particularly after laparoscopic neonatal Ladd procedures, and reintervention is needed for recurrent volvulus, adhesive obstruction, a missed duodenal web or annular pancreas, internal hernia or acquired atresia. ^[1]
• Follow-up should be tailored to the child; prolonged problems are covered under complications and prognosis below.

Not every malrotated bowel needs surgery today. A Ladd procedure may be performed prophylactically in a well patient in whom malrotation is found incidentally, or electively in a symptomatic patient without volvulus, including in heterotaxy; but that practice is genuinely controversial, and published guidance differs. ^{[2] [4]} The decision requires weighing the lifetime risk of sudden volvulus against operative risk and should involve paediatric surgery and, where relevant, cardiology.

• Midgut volvulus and ischemia. Venous congestion, gangrene, perforation, peritonitis and sepsis; the catastrophe that the whole topic is about. ^{[3] [6]}
• Short bowel syndrome. After massive resection, with dependence on parenteral nutrition and, in extreme cases, intestinal transplantation. ^[6]
• Duodenal obstruction from Ladd bands even without volvulus.
• Associated anomalies. Annular pancreas, duodenal web/atresia, Meckel diverticulum, intestinal duplication, congenital heart disease, Down syndrome. ^[1]
• Postoperative. Adhesive bowel obstruction, recurrent volvulus (especially after laparoscopic neonatal operations), internal hernia through mesenteric defects, and acquired atresia. ^[1]
• Profound delayed diagnosis. Massive intestinal necrosis with multiple-organ dysfunction. ^[1]

Outcome tracks timing. When diagnosis is timely and bowel remains viable, results of the Ladd procedure are excellent. ^{[1] [3]} Mortality in neonates has fallen from about 30% in the 1960s to roughly 3% to 5% now. ^[3] When diagnosis is delayed, the picture darkens: transmural necrosis, extensive resection, short bowel syndrome with long-term parenteral nutrition, possible intestinal transplantation, or death from sepsis. ^{[6] [4]} The hard truth to communicate to families is that a baby can have normal clinical signs, a normal plain film, normal lactate and normal blood gases early on and still have progressing intestinal gangrene; hence the rule that bilious vomiting is investigated immediately even in a well baby. ^[2]

• Neonates, especially prematures. NEC can mimic and coexist; dysmotility and bile-stained aspirates in very preterm infants are easily misread, so a low threshold for surgical review is needed. ^[2]
• Children beyond infancy. Presentations are more variable (episodic pain, intermittent or non-bilious vomiting, poor weight gain) and are often mislabelled as gastro-oesophageal reflux. ^[6]
• Adults. Acute or chronic; CT is the usual diagnostic test. ^[7]
• Heterotaxy. High rate of rotational anomaly; timing of any operation and the width of the mesentery are debated; Ladd surgery, if done, is deferred until cardiac disease is stable. ^[4]
• Pregnancy. Colonic volvulus (not midgut) is the variety seen in pregnancy, when the gravid uterus predisposes the colon to torsion; midgut volvulus still requires early recognition. ^[7]

• Bilious vomiting is the trigger. Where resources are limited, the single most important action is to recognise green vomiting in a neonate as a surgical emergency and refer early. ^[3]
• UGI is the gold standard where contrast and fluoroscopy exist; if not available, ultrasound with an experienced operator (SMA/SMV relationship, whirlpool sign) is the best bedside substitute. ^{[2] [4] [5]}
• Plain radiography is inexpensive and widely available but cannot rule malrotation out; use it for other causes, not reassurance. ^[4]
• Intravenous fluid resuscitation, NG decompression and antibiotics are cheap, universally available life-savers while arranging transfer. ^{[2] [7]}
• Definitive surgery needs paediatric surgical expertise and anaesthesia. Refer early to a centre with that capability; the twist and necrosis do not wait. ^{[3] [6]}
• Histology (and documentation of vessel anatomy) helps centres learn from their cases.

• Malrotation is a common (about 1 in 500 live births) but mostly silent rotation/fixation defect of the midgut; the danger is volvulus. ^{[3] [6]}
• Incomplete or absent 270° counterclockwise rotation leaves a short, narrow mesentery and Ladd bands that can obstruct or twist. ^[4]
• Midgut volvulus presents in about 1 in 2,500 live births; roughly three-quarters of symptomatic cases are neonates and up to 90% occur in the first year. ^{[3] [6]}
• The classic neonatal sign is sudden bilious vomiting; 70% to 90% of symptomatic neonatal cases present this way. ^[6]
• Not every bilious vomit is malrotation (only 9% to 16% of episodes in term neonates are), but every bilious vomit must be investigated urgently. ^[6]
• Transmural necrosis can occur within about 8 to 16 hours of vascular compromise. ^[3]
• A normal abdominal examination and normal basic tests do not exclude early gangrene. ^[2]
• UGI contrast study remains the gold standard: look for an abnormal duodenojejunal junction and a "corkscrew" duodenum. ^{[2] [4]}
• Ultrasound is highly accurate (sensitivity 94%, specificity 100% in meta-analysis) and offers reversed SMA/SMV and the whirlpool sign, with no radiation. ^[5]
• A normal caecal position on enema does not exclude malrotation (up to 20% have a normal caecum). ^[4]
• Immediate management is nil by mouth, NG decompression, IV resuscitation, antibiotics and urgent surgical consultation; if shocked, operate without completing the imaging work-up. ^{[2] [3] [7]}
• The Ladd procedure does not restore normal rotation: it converts malrotation into a broad, stable non-rotation. ^{[4] [7]}
• Prognosis is excellent with early diagnosis and viable bowel; delayed diagnosis risks short bowel syndrome, parenteral nutrition, transplantation or death. ^{[4] [6]}
• Evidence on open versus laparoscopic Ladd surgery is mixed; laparoscopic neonatal Ladd has been associated with higher recurrent volvulus risk. ^[1]
• Asymptomatic/incidental malrotation is managed case by case; prophylactic Ladd is controversial. ^{[2] [4]}