Stensen's duct carcinomas

Undifferentiated carcinoma arising from the Stensen's duct: a case report and review of the literature

Primary carcinoma arising in Stensen's duct is an extremely rare and poorly understood tumor. A 38-year-old man was referred with a malignant lesion situated in the right cheek. The patient was treated by local resection, total parotidectomy, and modified radical neck dissection. Microscopic examination revealed tumor cells of basaloid pattern with squamous differentiation in some areas. The tumor showed a very aggressive behaviour with early local recurrence and metastatic disease. The histological and radiological findings suggest the origin from the Stensen's duct. Primary carcinoma of Stensen's duct should be histologically consistent with epidermoid, mucoepidermoid, or undifferentiated carcinoma. The diagnosis of true Stensen's duct carcinoma can be performed on the basis of clinical presentation, radiological findings, and tumor histology. Criteria for determination of origin in the duct are revised and compared with this case.

Mucoepidermoid carcinoma of Stensen's duct: A case report and review of the literature

BACKGROUND

Mucoepidermoid carcinoma of Stensen's duct is a rare neoplasm, with only five cases reported in the literature.

METHODS

We report another case of mucoepidermoid carcinoma of Stensen's duct and review the literature.

RESULTS

Stensen's duct neoplasms tend to be symptomatic at an early stage by causing an obstruction of the parotid duct. New imaging techniques such as MR sialography and sialoendoscopy are very helpful in diagnosis and patient management.

CONCLUSIONS

Although the rarity of this condition prevents definitive conclusions about the optimal treatment, we propose that Stensen's duct neoplasms should be treated like similar neoplasms occurring in the parotid gland tissue, taking into consideration clinical stage, tumor grade, and surgical margins.

Primary squamous cell carcinoma of accessory parotid gland duct epithelium: report of a case

A rare case of primary squamous cell carcinoma surrounding Stensen's duct in a 75-year-old man is presented. The tumor was a relatively well-defined, hard, subcutaneous mass, measuring 18 x 14 x 9 mm and situated in the right cheek. Microscopic examination of an excisional biopsy specimen revealed tumor cells showing squamous differentiation, a papillary growth pattern, and ductal structures with comedo necrosis. Immunohistochemical studies showed positive reactivity for KL-1 (cytokeratin, monoclonal), epithelial membrane antigen, and carcinoembryonic antigen in some tumor cells. The origin of the tumor was thought to be the accessory parotid gland duct epithelium.