Just to correct a typo in the first answer: the total number of nodes for a tree of depth L is (N^(L+1)-1) / (N-1)... (that is, to the power L+1 rather than just L). This can be shown as follows. First, take our theorem: 1 + N^1 + N^2 + ... + N^L = (N^(L+1)-1)/(N-1) Multiply both sides by (N-1): (N-1)(1 + N^1 + N^2 + ... + N^L) = N^(L+1)-1.
Malignancy is the most common cause of large bowel obstruction in older patients. Colon carcinoma without obstruction does not usually cause acute abdominal pain. Diverticulitis and colonic volvulus (i.e., narrowed, twisted lumen with a birdâs beak appearance) are less common causes of large bowel obstruction.4,5,14,35.
Bowel Obstructions. A mechanical bowel obstruction can develop in either the small intestine or the large intestine (also called the colon). The condition partially or completely prevents the contents of the intestine from flowing normally through the bowels. The picture on the left shows a blockage in the small intestine that might develop, for example, as a result of scar tissue formation (adhesions). The picture on the right shows a partial blockage in the colon caused by a tumor (cancer).