Cylindroma
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


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