title: The "doughnut sign" in subdural effusion.
mesh_terms: D014695:Cerebral Ventriculography; D003399:Craniotomy; D005260:Female; D006193:Haemophilus influenzae; D006801:Humans; D007223:Infant; D008581:Meningitis / Q000175:diagnosis*; D008583:Meningitis, Haemophilus / Q000150:complications; D011677:Punctures; D011877:Radionuclide Imaging; D013353:Subdural Effusion / Q000175:diagnosis* / Q000209:etiology / Q000601:surgery; D013667:Technetium
chemical_list: D013667:Technetium