title: Disappearance of plasma melatonin after removal of a neoplastic pineal gland.
mesh_terms: D000293:Adolescent; D001254:Astrocytoma / Q000601:surgery*; D001932:Brain Neoplasms / Q000601:surgery*; D002940:Circadian Rhythm; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D008297:Male; D008550:Melatonin / Q000097:blood*; D010870:Pineal Gland / Q000601:surgery*; D010871:Pinealoma / Q000601:surgery*
chemical_list: D008550:Melatonin