title: Porencephalic cyst of the mastoid.
abstract: A 10-year-old boy developed a porencephalic cyst of the mastoid in conjunction with otitic meningitis and cerebrospinal otorrhea. A defect of the tegmen tympani allowed extrusion of the cyst into the antrum and the mesotympanum. The otorrhea was controlled by closure of the defect. Our review of 251 cases in the literature showed no prior incidence of mastoid involvement by a porencephalic cyst.
mesh_terms: D001927:Brain Diseases / Q000000981:diagnostic imaging / Q000601:surgery*; D001930:Brain Injuries / Q000000981:diagnostic imaging; D002558:Cerebrospinal Fluid Otorrhea / Q000000981:diagnostic imaging; D002648:Child; D003560:Cysts / Q000000981:diagnostic imaging / Q000601:surgery*; D006801:Humans; D008297:Male; D008416:Mastoid / Q000601:surgery*; D008586:Meningitis, Pneumococcal / Q000601:surgery; D011859:Radiography