Paracollicular arachnoid pouches.
D000328:Adult; D000367:Age Factors; D001099:Arachnoid / Q000000981:diagnostic imaging; D001927:Brain Diseases / Q000000981:diagnostic imaging; D002533:Cerebral Angiography; D014695:Cerebral Ventriculography; D003560:Cysts / Q000150:complications / Q000000981:diagnostic imaging; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D006849:Hydrocephalus / Q000000981:diagnostic imaging / Q000209:etiology*; D007223:Infant; D008297:Male; D011011:Pneumoencephalography