[A case of primary colon amyloidosis presenting as hematochezia].

Amyloidosis is characterized by a deposition of insoluble fibrils in various organs and tissues. Amyloid deposition, in the gastrointestinal track, provokes a dysfunction of the organ, due to an accumulation of fibrils, and causes a variety of clinical symptoms and endoscopic findings. Primary amyloidosis in the gastrointestinal tract is rarely reported in Korea. We experienced a case of recurrent intestinal bleeding, in a 59-year-old female patient with primary amyloidosis. A colonoscopy revealed the presence of multiple large circular ulcers. In the entire colon, diffuse nodular lesions with edema and bleeding were found. A colonoscopic biopsy established the diagnosis of amyloidosis, to the exclusion of other disease components. We concluded that the patient had localized amyloidosis. Though a definitive therapeutic strategy has not been established for localized gastrointestinal amyloidosis, the patient has been successfully treated with a high-dose of steroids and azathioprine.