Pathnologic @pathnologic
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Path Geek - All things #pathology
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Here is a lymph node that is lymphoid-depleted, fibrotic, and burned-out, typical of late phase HIV
KyleBradleyMD "Pattern ... infection) - "Pattern ... phase between pattern ... Lymphadenitis #PatternC ... Pathology #Microscopy #LymphNode
Herpes Simplex Virus 
Lymphadenitis 
 • Expanded paracortex 
 • HSV-infected cells are 
present in areas
• HSV-infected cells ... Microscopy #Clinical #LymphNode
Paracoccidioides brasiliensis Lymphadenitis: 

Paracoccidioidomycosis is a systemic fungal infection rare in the US, but endemic in
fibrosis (A) and well-formed ... seen within giant cells ... Lymphadenitis #Pathology #LymphNode
Here is a lymph node with florid follicular hyperplasia typical of HIV lymphadenitis (so-called "pattern A",
KyleBradleyMD "Pattern ... Warthin-Finkeldey type giant cells ... Monocytoid B cells ... Lymphadenitis #PatternA ... Pathology #Microscopy #LymphNode
Tinea Versicolor - Physical examination revealed large, coalescing, hypopigmented patches and macules on her torso and
and meatball” pattern ... #Clinical #Derm
Schistocytes - The arrows point to schistocytes which are fragmented red blood cells. Also called schizocytes,
fragmented red blood cells ... schizocytes, these cells ... shapes of red cells ... a more generic term
Signet ring cell histiocytes in lymph node sinuses! This can mimic metastatic adenocarcinoma. Histiocytes have ingested
Signet ring cell ... #SignetRing #Cell ... #Histiocytes #LymphNode
Salivary acinic cell carcinoma is usually an H&E diagnosis for me- but this zymogen-granule poor variant
Salivary acinic cell ... characteristic staining pattern ... Salivary #Acinic #Cell
Glucagonoma-Associated Rash - The rash involved the arms, genitals, and buttocks and had progressed to the
tissue revealed a well-circumscribed ... Clinical #HONC #Derm
Grouped Pustules on an Erythematous Base - On physical examination, grouped, coalescing pustules that had scalloped
multinucleated giant cells ... #Clinical #Derm