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![](../photos/myeloid_sarcoma1a.jpg)
Image 1-Low power magnification shows a diffuse dermal infiltrate.
![](../photos/myeloid_sarcoma1.2a.jpg)
Image 2-The infiltrate is separated from the epidermis by a Grenz zone.
![](../photos/myeloid_sarcoma1.3a.jpg)
Image 3-Mononuclear cells are interspersed with extravasated red blood cells.
![](../photos/myeloid_sarcoma1.4a.jpg)
Image 4-The mononuclear cells are small and mitotically active.
![](../photos/myeloid_sarcoma1.7a_cd45ro.jpg)
Image 5-All of the cells are diffusely positive for CD45 (Leukocyte common antigen) and negative for cytokeratin and S100.
![](../photos/myeloid_sarcoma1.8a_cd56.jpg)
Image 6-Diffuse positivity for CD56 (natural killer cell phenotype)
![](../photos/myeloid_sarcoma1.6a_cd68.jpg)
Image 7-Diffuse positivity for CD68.
![](../photos/myeloid_sarcoma1.5a_mpo.jpg)
Image 8-Diffuse positivity for myeloperoxidase (MPO).
The tumor cells were negative for CD3, CD20, CD33, CD34, CD79a, CD99, CD117, and TdT.
What is your diagnosis? |
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Case Study
This is a 85 year old woman who presents with multiple ecchymotic plaques on the upper trunk.
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