CUTANEOUS APOCRINE MIXED TUMOR - DERIVED FROM THE APOCRINE DUCT OF THE FOLLICULO-SEBACEOUS-APOCRINE UNIT

We report a case of cutaneous mixed tumor (CMT) composed of tubular br anching structures lined by cells with apocrine characteristics. In ad dition, an apocrine duct in the outer sheath of an hair follicle was c onnected to the mixed tumor, a previously unreported finding. Follicul ar and sebaceous differentiation have been described in CMT, leading s ome observers to suggest the existence of an apocrine type of CMT and its presumed differentiation toward the folliculo-sebaceous-apocrine u nit (FSAU). Our case demonstrated continuity of an apocrine duct in th e FSAU and lends support to the previous speculations about the histog enesis of apocrine type of CMT.