Bilateral squamous cell carcinoma of the lacrimal sac.

A 42-year-old man presented with right-sided epiphora, a fleshy lesion emanating from the right inferior punctum and a painless mass below the medial canthal tendon. Biopsy of the lacrimal sac mass disclosed papillary squamous cell carcinoma in situ. The patient underwent wide local excision with clear surgical margins and remained disease free until 28 months later when he returned with hemorrhagic epiphora of the OS and fullness overlying the left lacrimal sac. Biopsy confirmed papillary squamous cell carcinoma in situ. He underwent similar excision and has remained disease free for 6 months. To the best of the authors' knowledge, this is the first report of bilateral squamous cell carcinoma of the lacrimal sac.