Abstract
We herein report a case of gastrointestinal (GI) Kaposi's sarcoma (KS) without cutaneous involvement in a 73-year-old man who had received immunosuppressive drugs for granulomatosis with polyangiitis. After one year of prednisolone use, he presented with tarry stool and severe anemia. Endoscopic and pathological examinations revealed bright-reddish protruding lesions with proliferating spindle cells positive for D2-40, CD34, and HHV-8, which are definitively diagnostic of GI-KS. Drug-induced KS without HIV infection or transplantation is extremely rare, and its clinical features remain unknown. Therefore, we conducted a literature review of steroid-induced KS.
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