immunodeficiency syndrome . patient with the acquired to Corynebacterium equi in a Pulmonary pseudotumour due

A case of inflammatory pseudotumour of the lung in a patient with the acquired immunodeficiency syndrome due to infection by Corynebacterium equi is described. Patients with the acquired immunodeficiency syndrome (AIDS) may develop a wide range of opportunist infections as a consequence of altered host defences. The course of AIDS is also complicated by malignant diseases, including aggressive forms of Hodgkin's disease, non-Hodgkin's lymphoma, and Kaposi's sarcoma.' The wide range of diseases seen and their often unusual presentations may lead to diagnostic difficulties. We recently observed a case of inflammatory pseudotumour of the lung resulting from infection by Corynebacterium equi, which posed considerable diagnostic difficulties before histological examination.