Nonspecific ulcers of the colon resembling annular carcinoma: subject review.

Diagnosis of nonspecific ulcers of the colon is extremely difficult before surgery. They may present as an acute abdominal emergency or have a more insidious onset and course. They are commonly found in the cecum, where they frequently perforate. The various symptoms associated with the disease, as well as its appearance on barium enema examination, are discussed. Four cases are described in which nonspecific ulcers of the colon resemble annular carcinoma.