[Naevus sebaceus Jadassohn and syringocystadenoma papilliferum. Epithelial hamartoma of the skin].

Harmartomas are tumor-like local deformations of tissue-parts. Thus tumors of epidermal appendages must be classified in this sense. Until now these deformations were also called "organoid nevus". In the present paper we report studies on the nevus sebaceus of Jadassohn and the syringocystadenoma papilliferum, especially with regard to the coincidence with other dermoepidermal changes. From 1955 to 1979 a total of 164 histological specimens were diagnosed as nevus sebaceus Jadassohn (NSJ) or syringocystadenoma papilliferum (SCAP) in the department of dermatology, University Hospital Hamburg. 134 were NSJ, 11 were SCAP and 19 were combinations of both tumors. The percentage of multiple deformations of all 164 organoid nevi were 24.