title: Ring sign in radionuclide cerebral images.
mesh_terms: D001932:Brain Neoplasms / Q000000981:diagnostic imaging* / Q000556:secondary; D002294:Carcinoma, Squamous Cell / Q000000981:diagnostic imaging* / Q000556:secondary; D003937:Diagnosis, Differential; D005625:Frontal Lobe / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011877:Radionuclide Imaging; D014057:Tomography, X-Ray Computed