[Muir-Torre syndrome. An interdisciplinary challenge].

Muir-Torre syndrome (MTS) is a rare autosomal dominant tumor syndrome characterized by the occurrence of tumors of the sebaceous glands and/or multiple keratoacanthomas in addition to internal neoplasia. Skin tumors include not only sebaceous adenomas and sebaceomas but also sebaceous carcinomas which are associated with colorectal carcinomas in over 50%, less commonly with carcinomas of the remaining gastrointestinal, urinary or genital tract. The underlying pathogenesis is a defect of the DNA mismatch repair system introducing microsatellite instability in tumor tissue.