Intestinal malrotation vs Midgut volvulus
How to tell Intestinal malrotation and Midgut volvulus apart when a board question makes them look alike.
Malrotation: the congenital anatomic setup, often silent; midgut volvulus: the acute twist around the SMA with bilious vomiting and corkscrew sign.
Side by side
Abnormal intestinal rotation and fixation with misplaced duodenojejunal junction, predisposing to twisting.
Acute twisting of bowel around the mesenteric axis with bilious vomiting, severe pain, whirlpool sign, and ischemia risk.
Embryologic rotation/fixation error leaves a narrow mesenteric base and abnormal bowel position.
The malrotated bowel twists around the superior mesenteric vessels, compromising blood flow.
Upper GI series showing abnormal duodenojejunal junction supports malrotation.
Whirlpool sign, acute bilious obstruction, lactic acidosis, or peritonitis concern supports volvulus.
The trap
Malrotation and midgut volvulus are not interchangeable. Malrotation is the underlying anatomic setup (the midgut failed to rotate correctly during development), and many people with malrotation remain asymptomatic into adulthood. Volvulus is the acute twisting complication around the SMA that causes ischemic bowel and is the emergency. Bilious vomiting in a newborn is volvulus until proven otherwise get an urgent upper GI series for corkscrew sign and proceed to emergent Ladd procedure if confirmed. After a Ladd procedure the appendix is repositioned out of the right lower quadrant, so future appendicitis presents atypically.
The repair move
When malrotation appears, ask whether there is active volvulus and threatened bowel perfusion.
Try a free question
CoreAn infant has bilious vomiting and an upper GI series shows abnormal position of the duodenojejunal junction without current twisting or ischemia. Which diagnosis best fits?
Show answer and explanation
Answer: A. Intestinal malrotation. Malrotation is abnormal intestinal rotation/fixation that predisposes to volvulus but is not itself the twist.
Why the other choices are tempting
- B. Midgut volvulus is active twisting that can compromise blood flow.
- C. Pyloric stenosis causes nonbilious vomiting.
- D. Zenker diverticulum is an adult pharyngoesophageal pouch.
- E. Barrett esophagus is reflux-driven metaplasia.
Flashcards
Tap a card to flip it.
What surgical repair is associated with malrotation/volvulus risk?
A Ladd procedure is the classic operation used to correct malrotation and reduce volvulus risk.
What is midgut volvulus?
It is twisting of bowel around the mesenteric axis, risking vascular compromise.
Quick answers
What is the fastest way to tell Intestinal malrotation from Midgut volvulus?
Malrotation: the congenital anatomic setup, often silent; midgut volvulus: the acute twist around the SMA with bilious vomiting and corkscrew sign.
What is the key clue for Intestinal malrotation?
Abnormal intestinal rotation and fixation with misplaced duodenojejunal junction, predisposing to twisting.
What is the key clue for Midgut volvulus?
Acute twisting of bowel around the mesenteric axis with bilious vomiting, severe pain, whirlpool sign, and ischemia risk.
What is the common trap with Intestinal malrotation vs Midgut volvulus?
Malrotation and midgut volvulus are not interchangeable. Malrotation is the underlying anatomic setup (the midgut failed to rotate correctly during development), and many people with malrotation remain asymptomatic into adulthood. Volvulus is the acute twisting complication around the SMA that causes ischemic bowel and is the emergency. Bilious vomiting in a newborn is volvulus until proven otherwise get an urgent upper GI series for corkscrew sign and proceed to emergent Ladd procedure if confirmed. After a Ladd procedure the appendix is repositioned out of the right lower quadrant, so future appendicitis presents atypically.