Kaposi's sarcoma (KS) is a vascular / mesenchymal tumor with an indefinite degree of malignancy, caused by complex etiopathogenetic factors including Human Herpes Virus-8 infection of immunocompromised patients. For example, KS is more common in adult men with HIV. We describe 2 very rare cases of iatrogenic KS in children after hematopoietic stem cell transplant with isolated organ damage (case 1: lung; case 2: inguinal lymph node). KS is a potential complication of bone marrow transplant in pediatric patients and can occur in different age groups and at atypical sites.
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