The benign eccrine cylindroma is one of a number of histologically different tumors of the external auditory canal that have been grouped by some as "ceruminomas." 

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Histologically they are characterized by cords of basophilic cells, hyaline material, and cystic duct-like structures. Rarely, cases of malignant degeneration are reported. However, for the most part, these lesions are benign and should be treated with complete local excision. Radiotherapy may be useful in treating massive lesions not amenable to surgery.

In the past, authors have used the term cylindroma to refer to malignant lesions such as adenoid cystic carcinoma. The tumour differs from  adenoid cystic carcinoma in the absence of a cribriform structure as well as in the presence of the large cells.

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Eccrine cylindroma is a benign tumour arising from sweat glands in the skin. It favours the face, forehead and scalp involving the turban area and hence is called a turban tumour. Amongst a variety of tumours originating from adnexal skin structures, which may appear in the ear canal, eccrine cylindroma forms a very rare entity. We present such a case and discuss its pathological and clinical features.

Benign eccrine cylindroma of the external auditory canal.Laryngoscope. 1980 Mar;90(3) : 379-82.

The benign eccrine cylindroma is one of a number of histologically different tumors of the external auditory canal that have been grouped by some as "ceruminomas." The eccrine cylindroma, malignant apocrine gland tumors, and the adenoid cystic carcinomas of salivary gland origin are distinctly different histologically and in natural history and prognosis. Therapy should, therefore, be tailored to the specific tumor. A patient is presented who developed an asymptomatic external auditory canal mass that was initially incompletely excised. A recurrence five years later again proved to be a benign eccrine cylindroma of sweat gland origin. Successful and adequate treatment was local excision with a cuff of normal tissue. A variety of tumors originating from the adnexal skin structures may appear in the external auditory meatus and canal. Treatment must include biopsy and close consultation with the pathologist. The term cylindroma has been loosely applied to both benign and malignant glandular neoplasms but its usage should be restricted to the specific benign eccrine cylindrome herein described. A rationale of therapy is presented.

Benign dermal cylindroma of the external auditory canal: a clinicopathological report.Am J Otolaryngol. 1985 Jan-Feb;6(1):35-8.

Considerable confusion exists regarding the nature of benign dermal cylindroma of the external auditory canal. In the past, authors have used the term cylindroma to refer to malignant lesions such as adenoid cystic carcinoma. Benign dermal cylindroma is a specific clinical entity consisting of benign tumors arising from the epidermal appendages; however, whether they are apocrine- or eccrine-derived is not conclusively known. Six per cent are reported to be related to the ear. Histologically they are characterized by cords of basophilic cells, hyaline material, and cystic duct-like structures. Rarely, cases of malignant degeneration are reported. However, for the most part, these lesions are benign and should be treated with complete local excision. Radiotherapy may be useful in treating massive lesions not amenable to surgery.

Malignant cylindroma of the external auditory canal. Otol Neurotol. 2006 Jan;27(1):97-101.

OBJECTIVE: This report describes a case of a malignant cylindroma arising in the external auditory canal. STUDY DESIGN: Retrospective surgical case review. SETTING: Tertiary care teaching hospital. INTERVENTION: Wide local excision with margin control. RESULTS: Local control of disease at 2-year follow-up. CONCLUSION: To our knowledge, this is the first report describing a malignant degeneration of cylindroma in the external auditory canal. This tumor represents an extremely rare cutaneous neoplasm, thus raising diagnostic and therapeutic challenges.
 

Neoplasms of the External Ear ;

Squamous CellCarcinoma of the External Ear ;

Verrucous Carcinoma of theExternal Ear; 

Basal cell carcinoma of the External Ear;

Ceruminous Adenoma of the External Ear;

Syringocystadenoma Papilliferum of the External Ear;

Adenoid Cystic Carcinoma of the External Ear ;