ArticleInternational journal of surgical pathology2026
Mycobacterial Spindle Cell Pseudotumor Presenteing as an Aggressive Lytic Lesion in the Tibia in an Immunocompromised Patient.
Article in International journal of surgical pathology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Mycobacterial spindle cell pseudotumor is a rare manifestation of atypical mycobacterial infection. The process consists of a tumor-like proliferation of bland, spindle-shaped histiocytes that contain acid-fast-positive mycobacteria. Most patients are immunocompromised, and the lymph nodes are the most commonly involved site. The presentation of this process as an isolated aggressive osseous lesion is rare and conjures up a wide differential diagnosis, including neoplastic conditions. Accurate diagnosis of this entity is essential for proper management. We report a 79-year-old man with hypogammaglobulinemia who presented with an aggressively appearing lytic tibial lesion after sustaining a fall. Biopsy of the lesion revealed a mycobacterium-laden spindle cell pseudotumor without granuloma formation. The mycobacteria were visible on acid-fast Ziehl-Neelsen (AFB) stain and modified acid-fast (Fite) stain as well as PAS and GMS stains. PCR of the microbiology culture identified
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