MedGen

A rare neural tube closure defect with characteristics of partial lack of bone fusion resulting in sac-like protrusions of the brain and the membranes that cover it through the openings in the skull. Protruding tissue may be located on any part of the head but most often affects the occipital area. Depending in the size and location, encephalocele are often associated with neurological problems including intellectual disability, seizures, vision impairment, ataxia and hydrocephalus. This disorder is not associated with a polymalformative syndrome. [from SNOMEDCT_US]

A neural tube defect characterized by sac-like protrusions of the brain and the membranes that cover it through openings in the skull. [from HPO]

A congenital malformation with a cleft (gap or opening) in the midline of the face. [from HPO]

The term frontonasal dysplasia was coined by Sedano et al. (1970) to describe a constellation of findings limited to the face and head. The disorder is defined as 2 or more of the following: (1) true ocular hypertelorism; (2) broadening of the nasal root; (3) median facial cleft affecting the nose and/or upper lip and palate; (4) unilateral or bilateral clefting of the alae nasi; (5) lack of formation of the nasal tip; (6) anterior cranium bifidum occultum (see 168500); and (7) a V-shaped or widow's peak frontal hairline (Sedano and Gorlin, 1988). Most reported cases are sporadic, but a few familial cases have been reported. Twigg et al. (2009) characterized frontonasal malformation (FNM) as a 'very heterogeneous group of disorders' and summarized clinical features. Also see acromelic frontonasal dysplasia (AFND; 603671), frontofacionasal dysplasia (FFND; 229400), oculoauriculofrontonasal syndrome (OAFNS; 601452), the acrofrontofacionasal dysostosis syndromes (201180, 239710), and craniofrontonasal syndrome (304110). Genetic Heterogeneity of Frontonasal Dysplasia Frontonasal dysplasia-2 (FND2; 613451) is caused by mutation in the ALX4 gene (605420) on chromosome 11p11. Frontonasal dysplasia-3 (FND3; 613456) is caused by mutation in the ALX1 gene (601527) on chromosome 12q21. [from OMIM]

A congenital malformation with a cleft (gap or opening) in the face. [from HPO]

A type of anterior encephalocele in which there is a protrusion of the contents of the skull through a breach at the point where the frontal and ethmoidal bones meet. Frontoethmoidal encephalocele can be divided further into three distinct categories [from HPO]

A congenital defect in the skull, whereby there is a protrusion of part of the cranial contents through a congenital defect in the cranium, usually covered with skin or mucous membrane. The term encephalocele refers to a subclass of these lesions in which brain tissue protrudes through the defect. [from HPO]