We report a case of acute promyelocytic leukemia (APL) following ulcerative colitis (UC). A 23-year-old man was diagnosed as UC in January 1991 and had been treated with salazosulfapyridine and prednisolone with good effect. In September 1993, he developed bleeding tendency and a diagnosis of APL with disseminated intravascular coagulation was made based on the results of bone marrow aspiration and coagulation profile. Complete remission was achieved with All-trans retinoic acid together with combined chemotherapy. He died of sepsis during consolidation chemotherapy in December 1993. Autopsy revealed no recurrence of UC.
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