Source:http://linkedlifedata.com/resource/umls/id/C0687708
CSP: disorders characterized by the liver excessively producing porphyrins or their precursors, arising from abnormalities in the regulation of the porphyrin-heme pathway existing at, and usually before, birth regardless of causation; porphyria, acute intermittent and porphyria cutanea tarda are types of hepatic porphyria.