The document discusses sigmoid and cecal volvulus, which are types of intestinal obstructions caused by the twisting of segments of the large intestine. Sigmoid volvulus is more common and involves twisting of the sigmoid colon, often requiring decompression or surgery if decompression fails. Cecal volvulus involves twisting of the cecum and is less likely to cause complete obstruction, being treatable in many cases with cecopexy to secure the cecum to the abdominal wall.