A 'string of pearls' appearance is seen in -

Ans. is 'a' i.e., Small Bowel Obstruction o The string of pearls (or beads) sign can be seen on upright or decubitus abdominal radiographs as well as on CT in patients with small bowel obstruction, increased intraluminal fluid, and slow resorption of intraluminal gas.o It consists of an obliquely or horizontally oriented row of small gas bubbles in the abdomen, which represent small pockets of gas along the superior wall of the small bowel that are trapped between the valvulae conniventes. The inferior margins of these bubbles have an ovoid appearance due to the meniscal effect of the intraluminal fluido The string of pearls sign, when present in the appropriate clinical setting, is virtually diagnostic of small bowel obstruction.