Paraneoplastic pemphigus. A trait d’union between dermatology and oncology

Paraneoplastic pemphigus is a rare autoimmune disease of the skin associated with neoplasm. Nowadays, the pathogenesis of paraneoplastic pemphigus is not fully understood. Due to its rarity, various criteria have been proposed for the diagnosis. For this reason, several diagnostic methods have been considered useful for the diagnosis of paraneoplastic pemphigus including indirect immunofluorescence, direct immune of fluorescence, immunoprecipitation,immunoblotting, and enzyme-linked immunosorbent assay (ELISA). However, the polymorphic clinical features and the various results of laboratory tests and pathological evaluation present a challenge for the clinician