title: The halo sign of an encapsulated hematoma.
mesh_terms: D001916:Brachial Artery / Q000473:pathology; D003937:Diagnosis, Differential; D006406:Hematoma / Q000000981:diagnostic imaging* / Q000473:pathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D011877:Radionuclide Imaging; D013667:Technetium; D014463:Ultrasonography
chemical_list: D013667:Technetium