RESUMEN
Oral melanoacanthoma is an uncommon reactive lesion, characterized by basal and prickle cell keratinocyte proliferation surrounded by pigment-laden dendritic melanocytes. Plasma cell cheilitis (PCC) is an inflammatory disorder of unknown aetiology, microscopically presenting a dense plasma cell infiltrate. Most PCC cases affect the lower lip. Langerhans cell hyperplasia (LCHyp), a non-neoplastic counterpart of the LC proliferations, has been reported in association with chronic inflammatory skin diseases. Here, we present an unusual association of melanoacanthoma, PCC and LCHyp on the lower lip in a 59-old-year male, expanding the clinicopathological spectrum of these uncommon lesions. The dendritic melanocytes were highlighted by Fontana-Masson stain and HMB-45, whereas S100, CD1a and CD207 evidenced numerous LCs. MUM1/IRF4, EMA, and CD138 highlighted sheets of polyclonal plasma cells, with an IgG4+/IgG+ ratio of 24%. FTA-ABS test for syphilis was negative.
RESUMEN
Las dermatosis plasmocitarias comprenden un conjunto de enfermedades inflamatorias de causa desconocida y evolución incierta. Se han descrito para ellas múltiples tratamientos con resultados dispares y éxitos terapéuticos anecdóticos, con recaídas posteriores en la mayoría de los casos. Presentamos en este trabajo, además de una actualización y revisión del tema, cuatro dermatosis plasmocitarias que tuvimos oportunidad de ver en nuestro Servicio: la conocida balanitis de Zoon, las poco descritas vulvitis de Zoon y queilitis plasmocitaria y la infrecuente plasmocitosis cutánea de la que hay muy pocos reportes a nivel mundial. Queremos con este trabajo integrar didácticamente las dermatosis benignas, producidas directamente por la infiltración de plasmocitos, sin causa subyacente demostrable.
Cutaneous plasmocitosys is a group of skin's inflammatories disorders with unknown cause and uncertain evolution. In all treatments cases they describe different and uneven results with a few therapeutic success, most of them with reopen symptoms. In the following work, besides an updates and reviews, we present four cases that we received in our Service. The known balanitis of Zoon, the almost unknown vulvitis of Zoon, plasma cell cheilitis and finally the very unfrequently cutaneous plasmocytosis, which is very worldwide unreported. A purpose of this work have a didactic will to include whole skin disorders directly caused for the plasma cells infiltration with no causes in background.