Clinical manifestations in semilobar holoprosencephaly
Abstract
Holoprosencephaly (HPE) is a brain malformation caused by a primary defect in induction and patterning of the rostral neurotube (basal forebrain) during the first 4 weeks of embryogenesis. T his defect results in incomplete separation of the cerebral hemispheres.
Based on the degree of hemispheric nonseparation, HPE traditionally has been classified into three types: alobar, semilobar, and lobar.! In 1963, DeMyer et al. mentioned that defects in brain development may frequently coexist with abnormalities on the midfacial region. T he median facio-cerebral anomalies appear in various associated gradations and combinations.
When combined in patterns, these facies always predict a severe, highly characteristic brain anomaly.2
References
2. DeMyer W, Zeman W, Palmer CG. The face predicts the brain: diagnostic significance of median facial anomalies for holoprosencephaly (arhinencephaly). Pediatrics. 1964;34,256·63.
3. Lewis Aj, Simon EM, Barkovich Aj, Clegg Nj, Delgado MR, Levey E, et al. Middle interhemispheric variant of holoprosencephaly: a distinct cliniconeuroradiologic subtype. Neurology. 2002;59,1860·5.
4. Barr M, Cohen MM. Holoprosencephaly survival and perfonnance. Semin Med Genet. 1999;89:116-20.
5. Chang LH. Alobar holoprosencephaly: report of two cases with unusual findings. Chang Gung Med J. 2003;26,700·6.
6. Cohen MM Jr. Perspectives on holoprosencephaly. Part I. Epidemiology, genetics and syndromology. Teratology. 1989;40,211·35.
7. Cohen MM Jr. Perspectives on holoprosencephaly. Part III. Spectra, distinctions, continuities, and discontinuities. Am j Med Genet. 1989;34.271·88.
8. Dellovade T, Romer JT, Curran T, Rubin L. Hedgehog pathway and neurologic disorders. Ann Rev N eurosci. 2006;29,536·63.
9. Ming JE, Muenke M. Holoprosencephaly: from Homer to Hedgehog. Clin Genet. 1998;53,155·63.
10. Mercier S, Dubourg C, Belleguic M, Pasquier L, Loget P, Lucas J, et al. Genetic counseling and 'molecular' prenatal diagnosis of holoprosencephaly. Am J Med Genet C Semin Med Genet. 201O;154C,191·6.
11. Traggiai C, Stanhope R. Endocrinopathies associated with midline cerebral and cranial malformations. J Pediatr. 2002; 140,252·5.
12. Bruyere H, Favre B, Douvier S, Nivelon-Chevalier A , Mugneret F. D e novo interstitial proximal deletion of 14q and prenatal diagnosis ofholoprosencephaly. Prenatal Diag. 1996; 16, 1059·60.
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Accepted 2016-09-28
Published 2011-06-30