{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,22]],"date-time":"2026-10-22T04:37:19Z","timestamp":1792643839492,"version":"4.5.0"},"reference-count":38,"publisher":"SAGE Publications","issue":"9","license":[{"start":{"date-parts":[[1999,9,1]],"date-time":"1999-09-01T00:00:00Z","timestamp":936144000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Child Neurol"],"published-print":{"date-parts":[[1999,9]]},"abstract":"<jats:p>The clinical presentation of children with Joubert syndrome can include nonspecific features such as hypotonia, ataxia, and developmental delay. Careful examination of the face shows a characteristic appearance, and a neuro-ophthalmologic examination shows the presence of oculomotor apraxia. In the neonatal period, most children have hyperpnea intermixed with central apnea. Neuroimaging of the head in the axial plane demonstrates the \"molar tooth sign\"\u2014deep posterior interpeduncular fossa, thick and elongated superior cerebellar peduncles, and hypoplastic or aplastic superior cerebellar vermis. The central nervous system malformation spectrum observed in radiologic and neuropathologic studies accounts for many clinical features of Joubert syndrome. The developmental delay and cognitive impairment cannot be fully explained by the hindbrain malformation and probably result from dysfunction of the cerebral hemispheres. Although related conditions with vermian hypoplasia or aplasia (including Arima; Senior-Loken; and cerebellar vermian hypoplasia, oligophrenia, congenital ataxia, coloboma, and hepatic fibrosis syndromes) can mimic Joubert syndrome, detailed imaging data are lacking in such cases. We propose a revision in diagnostic criteria for Joubert syndrome. 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