Pathnologic @pathnologic
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Path Geek - All things #pathology
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Here are very large, immature myeloblasts with many nucleoli. A distincitve feature of these blasts is
a linear red "Auer ... #Clinical #Path ... Smear #Microscopy #Auer
Acute promyelocytic leukemia (blood). Typical morphologic features are bilobed ("butterfly") nuclei with dispersed chromatin, subtle to
granules, and Auer ... KyleBradleyMD #Auer ... leukemia #APL #APML #Pathology
A 37-year-old woman initially presented with pancytopenia and found to have leukopenia (2.1 × 103/μL) with
with occasional Auer ... consistent with Auer ... addition to APL, Auer ... #Clinical #Path ... Smear #Microscopy #Auer
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Herpes Simplex Virus 
Lymphadenitis 
 • Expanded paracortex 
 • HSV-infected cells are 
present in areas
Lymphadenitis #HSV #Pathology ... Microscopy #Clinical #LymphNode
Here is a lymph node that is lymphoid-depleted, fibrotic, and burned-out, typical of late phase HIV
Lymphadenitis #PatternC #Pathology ... #Microscopy #LymphNode
Paracoccidioides brasiliensis Lymphadenitis: 

Paracoccidioidomycosis is a systemic fungal infection rare in the US, but endemic in
Lymphadenitis #Pathology ... #LymphNode #Clinical
Signet ring cell histiocytes in lymph node sinuses! This can mimic metastatic adenocarcinoma. Histiocytes have ingested
#Histiocytes #LymphNode ... #Pathology #Clinical
Here is a lymph node with florid follicular hyperplasia typical of HIV lymphadenitis (so-called "pattern A",
Lymphadenitis #PatternA #Pathology ... #Microscopy #LymphNode
Squamous-Cell Carcinoma of the Tongue - Intraoral examination revealed a well-circumscribed superficial ulcer, with a homogeneous
red and white patch ... B) #Clinical #Pathology