Primary Hematopoietic and Lymphoid Tissue ›› Bone Marrow ›› Abnormal
Promyelocyte with Auer Rods*
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![](/images/scope_icon.gif) › Microscopic Features:- 3-4x larger than a mature RBC
- High nuclear to cytoplasmic ratio
- Round Nucleus with immature chromatin (not clumped)
- Prominent nucleoli
- Cytoplasm is not as scant as myeloblast, gray to pale blue with primary granules
- Multiple Auer rods may be seen as well
![](/images/normal_icon.gif) › Normal % blood-PB, marrow-BM, lymphoid tissue-LN:- PB: None
- BM: None
- LN: None
![](/images/resemble_icon.gif) › May Resemble:
![](/images/ddx_icon.gif) › Differential Diagnoses:
If in blood or in bone marrow: Acute Promyelocytic Leukemia (APL) |
![](/images/immuno_icon.gif) › Classic Immunophenotype:- CD34-
- CD117+
- HLA-DR-
- CD13+
- CD33+
- (they may have immunophenotypic aberrancies such as gain of CD56, etc.)
![](/images/cartoon_icon.gif) › Cartoon Image:
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![RBC](/images/rbc_clear.gif) for direct comparison![](/images/misc_icon.gif) › Misc:- Promyelocyte with multiple Auer rods are called a "Faggot cell" (Faggot meaning "Bundle of Sticks", the numerous auer rods resemble such)
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