(DCR) n. an operation to relieve blockage of the nasolacrimal duct (which drains tears into the nose), in which a communication is made between the lacrimal sac and the nose by removing the intervening bone. It is done via a skin incision (external DCR) or through the nose (endonasal DCR). See dacryocystitis; lacrimal apparatus.... dacryocystorhinostomy
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