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Medical Definition of Coproporphyria
1. Presence of coproporphyrins in the urine, as in variegate porphyria. Hereditary coproporphyria, an inherited (autosomal dominant) disorder of a deficiency of coproporphyrinogen oxidase, resulting in overproduction of porphyrin precursors leading to neurological disturbances and photosensitivity. (05 Mar 2000)