MedlinePlus Genetics:
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Lateral meningocele syndrome is a disorder that affects the nervous system, the bones and muscles, and other body systems. The condition is characterized by abnormalities known as lateral meningoceles. Lateral meningoceles are protrusions of the membranes surrounding the spinal cord (known as the meninges) through gaps in the bones of the spine (vertebrae). The protrusions are most common and typically larger in the lower spine.The meningoceles associated with this disorder may damage the nerves that spread from the spine to the rest of the body. Damage to the nerves that control bladder function, a condition called neurogenic bladder, causes affected individuals to have progressive difficulty controlling the flow of urine. Prickling or tingling sensations (paresthesias), progressive stiffness and weakness in the legs (paraparesis), and back pain can also occur. Delayed development of motor skills in infancy, such as sitting and crawling, often occurs in this disorder; intelligence is usually unaffected.Other features of lateral meningocele syndrome can include low muscle tone (hypotonia) during infancy, decreased muscle bulk, loose (hyperextensible) joints that can lead to dislocations, and protrusion of organs through gaps in muscles (hernias). Spinal abnormalities are also common, including side-to-side curvature of the spine (scoliosis), abnormal joining (fusion) of two or more vertebrae, and vertebrae that are unusually shaped (scalloped).People with lateral meningocele syndrome typically have a particular pattern of facial features that may include high arched eyebrows, widely spaced eyes (hypertelorism), outside corners of the eyes that point downward (downslanting palpebral fissures), and droopy eyelids (ptosis). Affected individuals may have a flat appearance of the middle of the face and cheekbones (midface and malar hypoplasia); low-set ears; a long area between the nose and mouth (long philtrum); a thin upper lip; a high, narrow roof of the mouth, occasionally with an abnormal opening (a cleft palate); a small jaw (micrognathia); coarse hair; and a low hairline at the back of the neck.Other signs and symptoms that can occur in lateral meningocele syndrome include a high and nasal voice, hearing loss, abnormalities of the heart or the genitourinary system, poor feeding, difficulty swallowing (dysphagia), and backflow of stomach acids into the esophagus (called gastroesophageal reflux or GERD).
MalaCards based summary:
Lateral Meningocele Syndrome, also known as lehman syndrome, is related to meningocele and cerebral arteriopathy, autosomal dominant, with subcortical infarcts and leukoencephalopathy, type 1. An important gene associated with Lateral Meningocele Syndrome is NOTCH3 (Notch Receptor 3), and among its related pathways/superpathways are Disease and Signal Transduction. Affiliated tissues include spinal cord, heart and skin, and related phenotypes are ptosis and micrognathia
OMIM®:
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Lateral meningocele syndrome is a rare disorder characterized by distinctive facial features, hyperextensibility, hypotonia, and characteristic lateral meningoceles, which can result in neurologic complications such as bladder dysfunction and neuropathy. Dysmorphic features include dolichocephaly, hypertelorism, ptosis, microretrognathia, high-arched palate, long, flat philtrum, and low-set ears. Multiple additional variable features may also be observed, including cryptorchidism, vertebral anomalies, and connective tissue abnormalities. Early motor development is delayed, but cognition is usually normal (summary by Gripp et al., 2015). (130720) (Updated 08-Dec-2022)
UniProtKB/Swiss-Prot:
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A very rare skeletal disorder with facial anomalies, hypotonia and neurologic dysfunction due to meningocele, a protrusion of the meninges, unaccompanied by neural tissue, through a bony defect in the skull or vertebral column. LMNS facial features include hypertelorism and telecanthus, high arched eyebrows, ptosis, mid-facial hypoplasia, micrognathia, high and narrow palate, low-set ears and a hypotonic appearance. Additional variable features are connective tissue abnormalities, aortic dilation, a high-pitched nasal voice, wormian bones and osteolysis.
GARD:
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A rare genetic neurological disorder characterized by multiple lateral meningoceles, distinctive facial dysmorphism (including hypertelorism, downslanting palpebral fissures, posteriorly rotated ears, micrognathia, and high, narrow palate, among others), and skeletal abnormalities (e. g. vertebral anomalies, wormian bones, short stature, and scoliosis). Multiple additional features may present, such as conductive hearing impairment, hypotonia, and connective tissue and urogenital abnormalities. Cognition is usually normal.
Orphanet:
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A rare genetic neurological disorder characterized by multiple lateral meningoceles, distinctive facial dysmorphism (including hypertelorism, downslanting palpebral fissures, posteriorly rotated ears, micrognathia, and high, narrow palate, among others), and skeletal abnormalities (e. g. vertebral anomalies, wormian bones, short stature, and scoliosis). Multiple additional features may present, such as conductive hearing impairment, hypotonia, and connective tissue and urogenital abnormalities. Cognition is usually normal.
Disease Ontology:
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A syndrome characterized by facial anomalies, hyperextensibility, hypotonia, and meningocele-related neurologic dysfunction that has material basis in heterozygous mutation in NOTCH3 on chromosome 19p13.12.
Wikipedia:
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Lateral meningocele syndrome, also known as Lehman syndrome, is a very rare skeletal disorder with... more...
Rare neurological diseases 
