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KembaraXtra-Medicine – Intestinal Malrotation
Intestinal malrotation is a congenital condition resulting from incomplete rotation and fixation of the intestine during embryogenesis, specifically during the transition from the extracolonic position around the tenth week of gestation. It is commonly associated with heterotaxia syndromes and frequently occurs alongside other congenital anomalies. Gastrointestinal associations include duodenal stenosis or atresia, duodenal web, Meckel diverticulum, intussusception, gastroesophageal reflux, omphalocele, gastroschisis, congenital diaphragmatic hernia, abdominal wall defects, and Hirschsprung disease. Congenital cardiac anomalies are present in approximately 27% of patients and significantly increase morbidity.
The underlying pathology involves abnormal positioning of the duodenojejunal junction, which remains to the right of the midline, and malposition of the cecum, which is often located in the upper left abdomen with abnormal mesenteric attachments. This abnormal anatomy predisposes patients to bowel obstruction and volvulus. Midgut volvulus is a serious complication that occurs when the small intestine twists around the superior mesenteric artery and vein, leading to vascular compromise and potential bowel ischemia. Malrotation is found in combination with other congenital anomalies in up to 70% of cases, particularly involving the cardiac, esophageal, urinary, and anorectal systems.
Malrotation occurs in approximately 1 in 500 live births. It is more common in males, with a male-to-female ratio of 2:1 in neonates. About 75% of cases are diagnosed during the newborn period, and 90% are identified by one year of age, although presentation can occur in adulthood. Mortality in infants can be as high as 24%, and the presence of necrotic bowel at surgery increases mortality risk significantly.
Clinical presentation varies by age. Neonates typically present with bilious vomiting, abdominal distention, bloody stools, constipation or obstipation, feeding difficulties, and poor weight gain. Infants and children older than one year may present with abdominal pain followed by bilious emesis. Older children and adolescents often experience chronic vomiting, intermittent colicky abdominal pain, diarrhea, hematemesis, or constipation. Adults usually present with vague and nonspecific gastrointestinal symptoms. Notably, up to 75% of patients may have a normal physical examination at presentation. Severe cases may show signs of dehydration, metabolic acidosis, peritonitis, ischemic bowel, sepsis, or shock.
Diagnosis is suggested by clinical history and physical examination and is confirmed through imaging, most commonly contrast radiography. Laboratory evaluation includes complete blood count, venous blood gas, electrolytes, renal function tests, glucose, coagulation profile, lactate, and type and screen. Plain abdominal radiographs are diagnostic in fewer than 30% of cases but may show signs suggestive of volvulus, such as duodenal obstruction, gastric distention, paucity of distal bowel gas, generalized small-bowel distention, or a double-bubble sign. Upper gastrointestinal contrast studies are the diagnostic test of choice, with high sensitivity and accuracy, demonstrating abnormal position of the duodenojejunal junction, corkscrew appearance of the duodenum in volvulus, or right-sided jejunum. Contrast enema may help identify cecal position but has a significant false-negative rate. Ultrasound can demonstrate abnormal superior mesenteric artery–vein relationships and the classic whirlpool sign in volvulus, although a normal study does not exclude malrotation. CT imaging is generally reserved for adults.
Differential diagnosis depends on age and presentation. In early life, considerations include Hirschsprung disease, necrotizing enterocolitis, and intussusception. In children with acute abdominal pain and peritoneal signs, appendicitis and sepsis must be considered. Older children and adults with chronic or vague symptoms may be misdiagnosed with irritable bowel syndrome, peptic ulcer disease, biliary or pancreatic disorders, or psychiatric conditions.
Management of malrotation, particularly with midgut volvulus, is a surgical emergency. Initial stabilization focuses on airway, breathing, and circulation, with rapid intravenous fluid resuscitation to correct hypovolemia and metabolic acidosis. Broad-spectrum antibiotics are initiated if there are signs of sepsis or peritonitis. Nasogastric decompression and prompt surgical consultation are essential. Definitive treatment involves emergent surgical correction, including detorsion of the volvulus, restoration of intestinal perfusion, resection of necrotic bowel if present, and reassessment of bowel viability when necessary. Patients are kept nil per os and require close postoperative monitoring.
Hospital admission is indicated for acute abdomen, need for surgical intervention, significant dehydration, acidosis, sepsis, or shock. Discharge is uncommon and reserved for stable, asymptomatic patients with incidental findings after thorough pediatric surgical evaluation. Early recognition, rapid resuscitation, and timely referral to a facility with pediatric surgical expertise are critical to improving outcomes and reducing morbidity and mortality.
Intestinal malrotation is a congenital condition resulting from incomplete rotation and fixation of the intestine during embryogenesis, specifically during the transition from the extracolonic position around the tenth week of gestation. It is commonly associated with heterotaxia syndromes and frequently occurs alongside other congenital anomalies. Gastrointestinal associations include duodenal stenosis or atresia, duodenal web, Meckel diverticulum, intussusception, gastroesophageal reflux, omphalocele, gastroschisis, congenital diaphragmatic hernia, abdominal wall defects, and Hirschsprung disease. Congenital cardiac anomalies are present in approximately 27% of patients and significantly increase morbidity.
The underlying pathology involves abnormal positioning of the duodenojejunal junction, which remains to the right of the midline, and malposition of the cecum, which is often located in the upper left abdomen with abnormal mesenteric attachments. This abnormal anatomy predisposes patients to bowel obstruction and volvulus. Midgut volvulus is a serious complication that occurs when the small intestine twists around the superior mesenteric artery and vein, leading to vascular compromise and potential bowel ischemia. Malrotation is found in combination with other congenital anomalies in up to 70% of cases, particularly involving the cardiac, esophageal, urinary, and anorectal systems.
Malrotation occurs in approximately 1 in 500 live births. It is more common in males, with a male-to-female ratio of 2:1 in neonates. About 75% of cases are diagnosed during the newborn period, and 90% are identified by one year of age, although presentation can occur in adulthood. Mortality in infants can be as high as 24%, and the presence of necrotic bowel at surgery increases mortality risk significantly.
Clinical presentation varies by age. Neonates typically present with bilious vomiting, abdominal distention, bloody stools, constipation or obstipation, feeding difficulties, and poor weight gain. Infants and children older than one year may present with abdominal pain followed by bilious emesis. Older children and adolescents often experience chronic vomiting, intermittent colicky abdominal pain, diarrhea, hematemesis, or constipation. Adults usually present with vague and nonspecific gastrointestinal symptoms. Notably, up to 75% of patients may have a normal physical examination at presentation. Severe cases may show signs of dehydration, metabolic acidosis, peritonitis, ischemic bowel, sepsis, or shock.
Diagnosis is suggested by clinical history and physical examination and is confirmed through imaging, most commonly contrast radiography. Laboratory evaluation includes complete blood count, venous blood gas, electrolytes, renal function tests, glucose, coagulation profile, lactate, and type and screen. Plain abdominal radiographs are diagnostic in fewer than 30% of cases but may show signs suggestive of volvulus, such as duodenal obstruction, gastric distention, paucity of distal bowel gas, generalized small-bowel distention, or a double-bubble sign. Upper gastrointestinal contrast studies are the diagnostic test of choice, with high sensitivity and accuracy, demonstrating abnormal position of the duodenojejunal junction, corkscrew appearance of the duodenum in volvulus, or right-sided jejunum. Contrast enema may help identify cecal position but has a significant false-negative rate. Ultrasound can demonstrate abnormal superior mesenteric artery–vein relationships and the classic whirlpool sign in volvulus, although a normal study does not exclude malrotation. CT imaging is generally reserved for adults.
Differential diagnosis depends on age and presentation. In early life, considerations include Hirschsprung disease, necrotizing enterocolitis, and intussusception. In children with acute abdominal pain and peritoneal signs, appendicitis and sepsis must be considered. Older children and adults with chronic or vague symptoms may be misdiagnosed with irritable bowel syndrome, peptic ulcer disease, biliary or pancreatic disorders, or psychiatric conditions.
Management of malrotation, particularly with midgut volvulus, is a surgical emergency. Initial stabilization focuses on airway, breathing, and circulation, with rapid intravenous fluid resuscitation to correct hypovolemia and metabolic acidosis. Broad-spectrum antibiotics are initiated if there are signs of sepsis or peritonitis. Nasogastric decompression and prompt surgical consultation are essential. Definitive treatment involves emergent surgical correction, including detorsion of the volvulus, restoration of intestinal perfusion, resection of necrotic bowel if present, and reassessment of bowel viability when necessary. Patients are kept nil per os and require close postoperative monitoring.
Hospital admission is indicated for acute abdomen, need for surgical intervention, significant dehydration, acidosis, sepsis, or shock. Discharge is uncommon and reserved for stable, asymptomatic patients with incidental findings after thorough pediatric surgical evaluation. Early recognition, rapid resuscitation, and timely referral to a facility with pediatric surgical expertise are critical to improving outcomes and reducing morbidity and mortality.
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