A variant of eccrine spiradenoma which can be multiple on the scalp and can  coalesce to form a Turban tumour. In pathology, a cylindroma is a tumour with nests of cells that resemble a cylinder in cross section. Types include:

Dermal eccrine cylindroma, a benign tumour of the skin
Adenoid cystic carcinoma, a malignant tumour of the salivary gland

See also
CYLD cutaneous syndrome
List of cutaneous neoplasms associated with systemic syndromes


== External links ==
Exostosis has been reported in dinosaur fossils from several species, including Acrocanthosaurus atokensis, Albertosaurus sarcophagus, Allosaurus fragilis, Gorgosaurus libratus, and Poekilopleuron bucklandii. Hereditary multiple exostoses
Hereditary multiple exostoses (HME), also called hereditary multiple osteochondromas (HMO), is a condition that is estimated to affect 1 in 50,000 individuals. Multiple benign or noncancerous bone tumors develop in the affected individuals. The number and location vary among affected patients. Most people seem unaffected at birth; however, by the age of 12 years, they develop multiple exostoses. Affected individuals commonly complain of palpable and recognizable lumps (exostoses) at about the knees and in the forearms. The condition characteristically occurs bilaterally. It may lead to mild degrees of growth retardation and limb asymmetry. Genu valgum (commonly known as "knock-knees"), ankle valgus, and bowing and shortening of one or both of the forearm bones are common manifestations. Types
Buccal exostosis
Footballers ankle (exotosis of the ankle bone)
Hereditary multiple exostoses (HME)
Subungual exostosis
Surfers ear (exostosis of the ear canal)
Torus mandibularis
Torus palatinus
Calcaneal spur (heel spur)

See also
Ganglion cyst
List of radiographic findings associated with cutaneous conditions
Osteoma
Osteosclerosis
Pachyosteosclerosis
Pachyostosis

References
External links

The Ear and Balance Center, The Sonos Group
MHE Research Foundation (Multiple Hereditary Exostoses)