(dak″re-o-sis″top-to´sis) (dak″re-o-sis″to-to´sis) prolapse of the lacrimal sac.
dacryocystoptosis 1. A prolapse or downward displacement of the lacrimal sac. 2. A downward displacement of the lacrimal sac. Since this sac lies in the bony lacrimal fossa, such a condition cannot occur unless the bony structure is altered.