Cecal volvulus means torsion of the cecum around its own mesentery. It may result to obstruction. Demonstrated in this case is marked proximal bowel dilatation up to 10 cm with increase risk of bowel perforation and fecal peritonitis. 

The whirlpool sign (also known as the whirl sign) is seen when a structure twist on itself. It is described here owing to cecum rotates around its own cecal mesentery.