title: Peg "waves".
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000388:Air; D002555:Cerebrospinal Fluid; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D011011:Pneumoencephalography; D013501:Surface-Active Agents; D013679:Technology, Radiologic
chemical_list: D013501:Surface-Active Agents