Solid tumors rarely present with fever. Among those that do, carcinoma
of the colon has been infrequently reported as a primary cause of fev
er. This patient had carcinoma of the right colon with prolonged fever
, but no evidence of infection or gastrointestinal symptoms. At surgic
al resection, a caecal adenocarcinoma was found with metastases to the
mesentery and 10 of 40 lymph nodes. The patient's fever resolved afte
r 3 days. The patient remained healthy during 8 years of follow-up. Ri
ght-sided colon cancer is not often considered in the complete evaluat
ion of fever of undetermined cause.