Cecal Bascule: Definition and Etiology
Cecal bascule is a rare variant of cecal volvulus characterized by anterior and superior folding of the cecum onto the ascending colon without axial torsion, causing bowel obstruction. 1, 2
Definition and Pathophysiology
Cecal bascule represents the rarest subtype of cecal volvulus, accounting for only 5-20% of all cecal volvulus cases. 1 The key distinguishing feature is that the cecum displaces anteriorly and superiorly over the ascending colon in a folding motion, rather than twisting around its mesentery as occurs in typical cecal volvulus. 1, 2 This anterior displacement compresses the ascending colon and can progress to closed-loop obstruction, particularly when the ileocecal valve remains competent. 2
Causes and Risk Factors
Anatomical Predisposition
- Mobile cecum is the primary anatomical risk factor, resulting from incomplete fixation of the cecum to the retroperitoneum during embryogenesis. 1, 3
- Complete common mesentery due to midgut malrotation during fetal development creates abnormal cecal mobility and positioning. 4
- Peritoneal adhesions that tether the anterior cecum to the anterior surface of the ascending colon are commonly implicated. 1, 2
Clinical Conditions and Triggers
- Recent surgery and previous abdominal operations increase risk through adhesion formation. 3, 5
- Spinal cord injury appears to be an independent risk factor, possibly related to altered bowel motility and autonomic dysfunction. 5
- Pregnancy and postpartum state, hypothesized to occur due to mass effect from the gravid uterus displacing the cecum, with most cases reported after cesarean section. 3, 6
- Colonic infections and inflammation, including Clostridioides difficile colitis, which alter colonic motility. 7
- Bowel dysfunction, chronic constipation, ileus, and distal colonic obstruction. 1, 3
Important Clinical Context
The mean age of presentation is 55 years with slight male predominance (54%). 1 Patients typically present with abdominal pain (61%), distension (84%), and vomiting (30%), with an average diagnostic delay of 3.6 days. 1 Untreated cecal bascule carries a high mortality rate, and conservative management fails in approximately 95% of cases, making surgical intervention the definitive treatment. 2 Right hemicolectomy with primary ileocolic anastomosis is the recommended surgical approach, with near-zero recurrence rates. 8, 2 Endoscopic detorsion is contraindicated and ineffective for cecal bascule. 8