Presentation
Abdominal distension and constipation followed by diarrhea.
Patient Data
Age: 75 years
Gender: Male
From the case:
Sigmoid volvulus
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Case Discussion
The sigmoid colon twisting on the sigmoid mesocolon causing obstruction.
CT features:
large gas-filled loop lacking haustra, forming a closed-loop obstruction
whirl sign: twisting of the mesentery and mesenteric vessels
bird beak sign: if rectal contrast has been administered
x-marks-the-spot sign: crossing loops of bowel at the site of the transition
split wall sign: mesenteric fat seen indenting or invaginating the wall of the bowel
steel pan sign: a close resemblance to the percussion instrument known as a steelpan
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