[Malignant tumors of internal organs and dermatoses]

According to the author there are five possible kinds of relationship between visceral neoplasmas and diseases of the skin. 1. Instances in which neoplasma induces dermatosis (the so-called paraneoplastic diseases). 2. Instances in which defective immune mechanism or long-lasting immune suppression promote the development of neoplasma as well as of skin diseases due to microorganism and viruses. 3. Instances in which the tumor and dermatosis are associated without causal relationship. 4. Cases of malignant lymphoma arising from neoplastic proliferation of the cells of the reticulohistiocytic system involving visceral organs and the skin. 5. Skin metastases of internal neoplastic processes.