The "doughnut" sign in cerebral radioisotopic images.
D000328:Adult; D001927:Brain Diseases / Q000175:diagnosis*; D001932:Brain Neoplasms / Q000175:diagnosis*; D002533:Cerebral Angiography; D005260:Female; D006801:Humans; D007457:Iodine Radioisotopes; D008297:Male; D008875:Middle Aged; D009362:Neoplasm Metastasis; D011877:Radionuclide Imaging; D013667:Technetium
D007457:Iodine Radioisotopes; D013667:Technetium