Cylindroma (turban tumour) Cylindroma (turban tumour) A variant of eccrine spiradenoma that coalesce when multiple on the scalp, forming a ‘turban tumour’. Cylindroma (turban tumour) A variant of eccrine spiradenoma that coalesce when multiple on the scalp, forming a ‘turban tumour’. Cylindroma (turban tumour) A variant of eccrine spiradenoma that coalesce when multiple on the scalp, forming a ‘turban tumour’.