73 yrs old male with lymph node biopsy (neck). Threpine biopsy for staging: negative (not included).  
HISTO: ALCL like sparse large "anaplastic" cell infiltrate with T CD4+ cytotoxic phenotype, enriched with histiocytes (?) and FDC network disruption.  
IH: CD3/CD4+, TIA1+, GranzymB+, Ki67+ 80%, PD1/CD10/CD8(-), Bcl6+, EBER(-), EMA(-), CD30(-).  
 
SPECIAL features: PTCL with ALCL like appearance (large cell variant?).  
 
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