title: Arnold-Chiari malformation type I appearing after tonsillectomy.
mesh_terms: D001139:Arnold-Chiari Malformation / Q000145:classification / Q000209:etiology* / Q000473:pathology; D002648:Child; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D014068:Tonsillectomy / Q000009:adverse effects*; D014103:Torticollis / Q000209:etiology