Disseminated MYycobacterium kansasii infection with pancytopenia and interstitial nephritis

Disseminated Mycobacterium kansasii infection associated with pancytopenia was diagnosed in a 40-year-old man found to have granulomata in kidney and liver biopsy specimens. The M. kansasii was isolated from the urine and tissue obtained by renal biopsy. Serial renal biopsies and renal tissue obtained at autopsy showed severe interstitial fibrosis which was thought to represent a tissue response to the M. kansasii infection. The periportal and parenchymal fibrosis found in the liver at autopsy were consistent with a similar response in the liver.