Undifferentiated carcinoma salivary gland tumor regio retroauricula: a case report

Abstract

Background; Salivary gland tumors are rare, comprising 3-5% of head and neck carcinomas and 0.5% of all malignant tumors. Undifferentiated carcinoma (UC) of the salivary glands is a primary malignant tumor that is poorly differentiated and cannot be classified in other tumor groups. While rare, UC is significant due to its rapid progression. Its pathological nature and heterogeneity remain subjects of ongoing discussion.

Case Report: A 69-year-old woman presented with a lump behind her right ear for 2 months, initially pea-sized and growing to the size of a duck egg. The lump was painful intermittently. Physical examination revealed a solid, irregular mass measuring 8x5cm with firm boundaries. CT scan showed a mass in the right parotid gland extending to the retroauricular region and encasing the right carotid space, suggesting malignancy. The patient underwent wide excision, posterolateral neck dissection, and reconstruction with a deltopectoral flap and skin graft. A second surgery for flap revision and reconstruction was performed 1 month later.

Conclusion: UC of the salivary glands, though rare, is a critical entity due to its aggressive nature. Wide excision with adequate margins, combined with neck dissection, is appropriate for tumors confined to the gland. Postoperative radiotherapy benefits patients at high risk for locoregional recurrence.