title: Cranial extradural cyst.
abstract: A large skull defect due to an extradural collection of clear and colourless fluid in a 59-years-old man is described. Hesitantly, we consider this to be the consequence of skull erosion due to Pacchionian granulations.
mesh_terms: D001847:Bone Diseases / Q000150:complications / Q000000981:diagnostic imaging; D003560:Cysts / Q000000981:diagnostic imaging / Q000209:etiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography; D012886:Skull / Q000000981:diagnostic imaging*