Nontuberculous mycobacteria-associated spindle cell pseudotumor of the nasal cavity: a case report.

Kentaro Ohara, Tokuhiro Kimura, Koji Sakamoto, Yasunori Okada

研究成果: Article査読

7 被引用数 (Scopus)


Mycobacterial spindle cell pseudotumor (MSP) is a rare mass-forming lesion caused by mycobacterial infection, mostly in immunocompromised patients. Since it is composed of a proliferation of spindle-shaped fibrohistiocytic cells without forming epithelioid cell granulomas, histological distinction from other spindle cell lesions is often difficult and its pathophysiology is poorly understood. MSP arising in the nasal cavity is extremely rare, and only two cases have been reported previously. Here we report a case of MSP of the nasal cavity in an 83-year-old man with no evidence of immunodeficient state. The resected tumor consisted of spindle cells, which contained numerous acid-fast bacilli in the cytoplasm. By polymerase chain reaction and sequencing using DNA extracted from the paraffin sections, the bacilli were identified as Mycobacterium intracellulare. Immunohistochemistry revealed that the spindle cells were positive for CD68, CD11c and S100 protein, confirming the histiocytic nature of these cells. They were also positive for CD163 and CD204, suggesting that they showed a phenotype similar to alternatively activated (M2) macrophages and the phenotype might contribute to the maintenance of mycobacterial infection despite apparent immunocompetence of the host.

ジャーナルPathology international
出版ステータスPublished - 2013 5月

ASJC Scopus subject areas

  • 病理学および法医学


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