"Neoplastic cells of PCSM-TCL are medium- to-large-sized T cells with cerebriform nuclei which lack the expression of TFH-cell defining chemokine receptor CXCR5. These features are highly distinctive and can be invaluable in separating this rather indolent cutaneous T-cell lymphoid neoplasm from more aggressive lymphomas of TFH-cell phenotype including primary cutaneous TFH-cell lymphoma and skin involvement of AITL"xsd:string