Disseminated Kaposi sarcoma with osseous metastases in patients with HIV infection. Case report

Abstract

Background. Kaposi sarcoma is a low-grade vascular tumor affecting blood and lymphatic vessels associated with the human herpes virus type 8 (HHV-8). As a rule, the skin of the lower extremities is involved in the process first of all, and then other organs and lymph nodes are involved. There are 4 various types of the disease with different clinical picture: the classic, the endemic, the epidemic and immunosuppression subtype. The epidemic subtype is the most common and has the most aggressive course, with specific lesions of a multiple kind, including the skin, mucous membrane layers, the lymph nodes, the gastrointestinal tract, the lungs and the spleen. Osseous metastases are extremely rare.
 Aim. Show the case of Kaposi sarcoma with osseous metastases in patient with the human immunodeficiency virus (HIV) infection.
 Results. We observed a 43-year-old patient with HIV infection and stage 4b Kaposi sarcoma against the background of the irregular antiretroviral therapy in the progression stages. The duration of the anamnesis was 32 months. The clinical debut of the cancer process was noted with skin lesions on the shoulder. Histological and immunohistochemical analysis of skin biopsies showed the morphological picture of Kaposi sarcoma. HHV-8 was expressed in tumor cells. During the endoscopic examination the lesions of oral mucosa, stomach and proximal colon were confirmed morphologically, and spiral computed tomography of the chest revealed the lesions in the lungs. On this point, the patients received oxaliplatin-based chemotherapy and aetoposidum for 6 months and against the background of this treatment we observed the disease progression associated with the involvement of the retroperitoneal lymph nodes, the left adrenal gland and the penis. Circumcision was performed in the case associated with the involvement of the penis. The treatment was continued. The lytic left iliac bone lesion, the retroperitoneal lymph nodes, the iliac lymph node groups, as well as the left inguinal lymph nodes, the left adrenal gland and the lungs were characterized by a high F-18 FDG uptake after 3 months of the treatment, according to the results of Fluorine-18 fluorodeoxyglucose (F-18 FDG) positron emission tomography combined with computed tomography (PET/CT).
 Conclusion. Kaposi sarcoma in patients with HIV infection had an aggressively course with disseminated skin lesions and internal organ involvement, including bones as showed in this clinical case. In this case, the axial skeleton was more commonly involved. PET/CT is a diagnostic imaging method in the differential diagnosis and determination of the prevalence of the cancer process.