Lacrimal colic--an important ophthalmic symptom.

This concise case report introduces the novel concept of "lacrimal colic"-acute severe medial canthal pain resulting from sudden expansion of the lacrimal sac, commonly due to stone formation. The condition is compared with renal colic, in which a stone causes distension of the renal pelvis and similar severe pain. The case is presented with a concise literature review, and discussion on the relevance of the symptom in clinical practice.