@SIGMOID VOLVULUS - RADIOLOGIC SIGNS OF SIGMOID VOLVULUS 1. COFFEE BEAN SIGN Modality: Plain abdominal X-ray Description: A massively dilated loop of colon with apposed medial walls and a central cleft, resembling a coffee bean. The apex often points toward the right upper quadrant. 2. BIRD Contrast enema (barium or water-soluble) Description: Tapering of contrast at the site of the volvulus, where the twisted colon narrows into a sharp, beak-like appearance. 3. OMEGA LOOP SIGN Modality: Abdominal X-ray Description: A distended loop of sigmoid colon forms an omega (Ω)-shaped shadow. 4. BENT INNER TUBE SIGN Modality: Abdominal X-ray Description: Another term similar to the coffee bean sign; describes the appearance of a closed loop of distended bowel. 5. WHIRLPOOL SIGN Modality: CT scan or sometimes ultrasound Description: Swirling appearance of the twisted mesentery and vessels at the root of the sigmoid mesocolon. 6. INVERTED U SIGN Modality: Abdominal X-ray Description: The dilated sigmoid colon forms an inverted U shape, often centrally or left-sided. 7. FRIMANN-DAHL SIGN Modality: Abdominal X-ray Description: Three dense lines representing the twisted mesenteric folds converging toward the site of torsion. #MedTwitter #MedEd #MedX