Case report: Kaposi's sarcoma: an unusual presentation.

Kaposi's sarcoma (KS) is the most common tumor associated with HIV-1 infection, affecting 30% of HIV-infected homosexual men before the advent of highly active antiretroviral therapy (HAART). In the era of HAART, the incidence of KS has markedly declined. KS usually presents with cutaneous lesions, but it may involve other organs, most commonly the pulmonary and gastrointestinal systems. Isolated pulmonary KS without cutaneous involvement is rare, although intrathoracic KS is seen in up to 75% of patients with KS. We describe an unusual case of a patient with AIDS and isolated endobronchial KS despite a normal arterial pO2, normal pulmonary function tests, no cutaneous KS, and normal chest computed tomographic findings.