Amyloid Pseudo-Dacryolith and Nasolacrimal Obstruction in a 67-Year-Old Male.

A 67-year-old male with a 35-year history of left-sided epiphora presented with a nonpainful, noninflamed, left medial canthal mass and complete left nasolacrimal obstruction. During routine dacryocystorhinostomy, a lesion was present within the lacrimal sac that mimicked a lacrimal stone in appearance but with a consistency concerning for malignancy. Histologically, the lesion displayed apple-green birefringence on polarized light microscopy and Congo red staining.