RESUMO
Necrotizing and non-necrotizing epithelioid granulomatous chronic inflammation is the usual recognizable histopathologic presentation of mycobacterial infections. In immunosuppressed patients, atypical histomorphologic patterns may occur. Rare and diagnostically challenging manifestations of nontubercular mycobacterial infections in transplant and Human Immunodeficiency Virus (HIV)-infected patients include mycobacterial spindle cell pseudotumor and suppurative lesions. Lesions composed of nodular spindle cell proliferation mimicking inflammatory, histiocytoid and spindle cell tumors, and similarly suppurative lesions simulating abscesses have been mostly reported in association with nontuberculous mycobacterial infections mainly in nodal and various extranodal sites. Similar lesions related to Mycobacterium tuberculosis that involve serosal membranes are unusual and diagnostically challenging. Our aim is to report mycobacterial spindle cell pseudotumor-associated pericarditis, suppurative abscess-forming pleuritis, and cholesterol pleuritis due to tuberculosis in three HIV-infected young adult males. Initially, we confused the mycobacterial spindle cell pseudotumor for Kaposi sarcoma, the suppurative pleuritis for bacterial and fungal empyema, and the cholesterol pleuritis with rheumatoid arthritis. A prior knowledge of the immune status of our patients helped us confirm our final correct diagnosis of mycobacterial infection by performing Ziehl-Neelsen special stain. Polymerase chain reaction detected Mycobacterium tuberculosis in respiratory samples. Utilization of acid-fast special stains in all HIV-patients regardless of the histopathologic appearances, and the application of an appropriate panel of immunomarkers should help pathologists reach the correct diagnosis and avoid pitfalls. Without prior clinical knowledge, pathologists should raise this possibility in young patients with such unusual manifestations, because correct pathologic recognition is clinically important for the appropriate management of these vulnerable patients.
