title: False-positive results with the radioactive phosphorus test.
abstract: A chorioretinal granuloma that contained acid-fast bacilli and a choriodal nevus that consisted of benign nevus cells yielded false-positive radioactive phosphorus tests. The beta  emission exceeded that of the control areas by more than 100% in each case. The granuloma had infiltrated the sclera, permitting inflammatory tissue to be in closer proximity to the counting probe than was the normal choroid. The reason for the increased metabolic activity of the nevus cells remains unexplained.
mesh_terms: D000328:Adult; D000368:Aged; D002829:Choroid / Q000473:pathology; D002830:Choroid Neoplasms / Q000175:diagnosis; D005189:False Positive Reactions; D005260:Female; D005451:Fluorescein Angiography; D006099:Granuloma / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D008297:Male; D008545:Melanoma / Q000175:diagnosis; D010761:Phosphorus Radioisotopes; D012164:Retinal Diseases / Q000175:diagnosis* / Q000473:pathology; D014463:Ultrasonography; D014603:Uveal Diseases / Q000175:diagnosis / Q000473:pathology
chemical_list: D010761:Phosphorus Radioisotopes