What is the imaging finding associated with a sigmoid volvulus?

• A. Double bubble sign
• B. Twisted inner tube appearance
• C. Corkscrew sign
• D. String of pearls sign

Answer: (B)

The twisted inner tube appearance is an imaging finding associated with a sigmoid volvulus due to the characteristic way the distended sigmoid colon appears on radiographic studies. In cases of sigmoid volvulus, the sigmoid colon twists on itself, leading to obstruction and distention. This results in a long, tubular structure that can appear reminiscent of a twisted inner tube or a coiled, elongated structure on imaging, particularly on abdominal X-rays.

Imaging typically shows a markedly dilated sigmoid colon, often with a narrow point of constriction at the twist. This appearance is distinct and clinically significant because it helps differentiate sigmoid volvulus from other types of bowel obstructions. Recognition of this specific appearance is vital for timely management, which may include decompression or surgical intervention.

Other imaging findings associated with different conditions may include the double bubble sign indicative of duodenal atresia, the corkscrew sign often seen with midgut volvulus, and the string of pearls sign which is associated with small bowel obstructions. Each of these has its own unique presentations that aid in diagnosing specific gastrointestinal pathologies.