Primary Hematopoietic and Lymphoid Tissue ›› Bone Marrow ›› Myeloid ›› Monocytes & Precursors ›› Abnormal
Mycobacteria in Histiocytes
›Microscopic Features:
- Rod shaped acid fast bacilli present in the cytoplasm of histiocytes
- Acid fast stain highlights them as red rod shaped small structures
›Normal % blood-PB, marrow-BM, lymphoid tissue-LN:
- PB: None
- BM: None
- LN: None
›May Resemble:
- Histoplasma in histiocytes
- Leishmania in Histiocytes
- Cellular debris in Histiocytes
- Bacteria in Histiocytes
›Differential Diagnoses:
Leishmaniasis
Histoplasmosis
Cellular debris within histiocytes
Bacterial infection
Histoplasmosis
Cellular debris within histiocytes
Bacterial infection
›Classic Immunophenotype:
- N/A
›Cartoon Image:
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›Misc:
Mycobacteria are usually Acid Fast Stain positive