INTRODUCTION: Kaposi's sarcoma (KS) is a cancer that develops from the cells that line lymph or blood vessels. It usually appears as tumors on the skin or on mucosal surfaces such as inside the mouth, but these tumors can also develop in other parts of the body, such as in the lymph nodes, the lungs or digestive tract. KS involvement of GI tract may remain asymptomatic in the beginning or may present with mild non-specific abdominal symptoms, unlikely to be diagnosed in late stage. Here we are presenting a case of disseminated KS presented with rectal bleed in homosexual undiagnosed HIV patient. CASE DESCRIPTION/METHODS: A 33 yr old male with no significant past medical history, presented with 3-month history of constipation and progressive unintentional weight loss (40 lbs in 3 months). Lately, patient noticed his stool mixed with blood and mucus, early satiety and fatigue. Patient has family history significant for breast cancer and biliary cancer in mother. Patient is sexually active with 5 male partners. On presentation, vitals were stable and physical examination revealed multiple purple non-blanchable lesions on his extremities and trunk, a mass on the hard palate, supraclavicular and inguinal lymphadenopathy, external hemorrhoids, and a palpable mass in the rectum. Labs showing normocytic anemia with Hb of 10.3, ESR of 95 and CRP of 9.88. Patient was found to be positive for HIV with viral load of 118,255 and CD4 count of 236. Patient also had high IgG titers for Chlamydia trachomatis and CT abdomen and pelvis showed rectosigmoid mass with perirectal lymphadenopathy, inguinal adenopathy, and mild retroperitoneal lymphadenopathy. CT chest showed pulmonary metastasis and colonoscopy showed mild non-specific ileitis, nodule in descending colon and neoplasm in the rectum. Biopsy from the descending colon and rectal mass showed ulcerated Kaposi’s sarcoma and positive immunostaining for human herpes virus -8 (HHV-8). Patient was diagnosed with disseminated KS and started on anti-retroviral therapy (ART) and systemic chemotherapy. DISCUSSION: AIDS-associated disseminated KS is a rare entity. ART has resulted in marked decline in the incidence of KS. Due to the rapid and progressive nature of AIDS related KS, early diagnosis and institution of ART is crucial to achieving favorable prognosis. In addition, co-infection of HHV-8 with HIV promotes the oncogenicity of HHV-8 leading to rapid onset and progression of KS. Above patient responding well to the ART and Chemo going for surveillance Colonoscopy.Figure 1.: Kaposi Sarcoma on Hard Palate.Figure 2Figure 3.: Kaposi Sarcoma in Rectum.