Congenital, circumscribed malformation of the corial connective tissue with excessive formation of collagen and usually also elastic fibers. A distinction is made according to the clinical and histological appearance:
- Naevus elasticus (syn.: Naevus anelasticus)
- Connective tissue nevus, coarsely nodular-disseminated
- Connective tissuenevus (lumbosacral)
- Elastoma juvenile.
These diagnoses represent variants of one entity and can occur simultaneously in the same patient. Connective tissue nevi can occur in isolation or as part of hereditary syndromes, e.g. Pringle-Bourneville phacomatosis and Buschke-Ollendorf syndrome.