Familial basilar impression.
D000328:Adult; D001933:Brain Stem; D002869:Chromosome Aberrations; D025063:Chromosome Disorders; D006801:Humans; D008297:Male; D010375:Pedigree; D010985:Platybasia / Q000150:complications / Q000000981:diagnostic imaging / Q000235:genetics*; D011859:Radiography; D013595:Syringomyelia / Q000209:etiology