title: An unusual cause of "doughnut" sign in brain scanning.
abstract: The "doughnut" sign in brain scanning was originally described in association with certain mass lesions having central necrotic, cystic, or avascular areas. A case in which this pattern occurred as a result of a superficial lesion, a large cephalhematoma, is presented.
mesh_terms: D002675:Child, Preschool; D006407:Hematoma, Epidural, Cranial / Q000175:diagnosis*; D006801:Humans; D008297:Male; D011877:Radionuclide Imaging; D013667:Technetium
chemical_list: D013667:Technetium