title: Scintigraphic manifestations of infraction of the second metatarsal (Freiberg's disease).
abstract: Two patients with Freiberg's infraction of the second metatarsal are presented. The scintigraphic pattern of a photopenic defect with hyperactive collar is demonstrated as evidence of the existence of avascular necrosis or infarction in this entity. The photopenia was appreciated only on pinhole collimator images in our first patient. The later revascularization phase of avascular necrosis with diffuse increase in uptake is demonstrated scintigraphically in the second patient.
mesh_terms: D000293:Adolescent; D002648:Child; D005260:Female; D005534:Foot Diseases / Q000000981:diagnostic imaging*; D006801:Humans; D006940:Hyperemia / Q000000981:diagnostic imaging; D008684:Metatarsus / Q000098:blood supply / Q000000981:diagnostic imaging*; D010007:Osteochondritis / Q000000981:diagnostic imaging*; D010020:Osteonecrosis / Q000000981:diagnostic imaging; D011859:Radiography; D011877:Radionuclide Imaging; D013669:Technetium Tc 99m Medronate
chemical_list: D013669:Technetium Tc 99m Medronate