Poorly differentiated sebaceous carcinoma of the lacrimal sac in a young adult: A case report.

Lacrimal sac and nasolacrimal duct tumors are extremely rare, and most of them are malignant tumors, which are often misdiagnosed as chronic dacryocystitis. We herein report a rare case of a 29-year-old female, presented with a history of watering in the right eye associated with a rapidly progressive mass for 4 months near the medial canthus. Further clinical examination revealed firm, non-tender mass occupying the lacrimal sac fossa extending above the medial canthus. The systemic examination was unremarkable, with a palpable right submandibular lymph node palpable. Contrast-enhanced computerized tomography (CECT) orbit revealed a well-defined mass at the medial canthus extending into the osseous nasolacrimal canal. An excision biopsy was performed, and histopathology revealed a poorly differentiated sebaceous carcinoma of the lacrimal sac. The oncologist advised CECT chest, face, and neck post-surgery, which revealed malignant neoplastic changes at the right lacrimal sac region and lacrimal duct with metastasis at right nodes I b, II, V, and left nodes I b and II. Five-month follow-up showed no signs of recurrence.