Cysts, tumour-like lesions and response to tissue injury.

Abstract In this chapter lesions that may arise in the skin or subcutis and that are not strictly inflammatory or neoplastic in nature are given attention. These include follicular or adnexal cysts, developmental anomalies (sweat gland) apocrine cyst, response to tissue trauma, altered deposition of minerals, necrosis and tumour-like proliferations, fibroadnexal hamartoma, haematoma and haemorrhage, calcinosis, granulation tissue, and nodular fasciitis. Most of these processes can be identified on cytology, however, sometimes definitive diagnosis relies on histopathological examination.