Mycobacterium kansasii was isolated from the spleen of a patient with "hairy cell leukemia" (HCL) who had caseating necrosis in the spleen and in the liver. The disseminated infection in this patient suggests a cellular immunity deficit. Despite intensive investigations, the nature of the cell of origin in HCL remains unknown.
(JAMA 236:1878-1879, 1976)
Manes JL, Blair OM. Disseminated Mycobacterium Kansasii Infection Complicating Hairy Cell Leukemia. JAMA. 1976;236(16):1878-1879. doi:10.1001/jama.1976.03270170044026