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Pontocerebellar hypoplasia in two siblings with dysmorphic features
Embiya Dilber1, Fatma Müjgan Aynaci, Ali Ahmetoglu
1Department of Pediatrics, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey.
Insights
This study details two siblings with pontocerebellar hypoplasia, highlighting unique clinical features beyond typical presentations. The findings suggest an expanded phenotype for this rare neurological disorder, particularly type II.
Area of Science:
- Neuroscience
- Genetics
- Pediatric Neurology
Background:
- Pontocerebellar hypoplasia (PCH) is a group of rare genetic disorders characterized by severe underdevelopment of the cerebellum and pons.
- Clinical manifestations typically include profound intellectual disability, motor deficits, and early-onset epilepsy.
Observation:
- Two siblings presented with progressive microcephaly, mental and motor retardation, truncal ataxia, strabismus, and progressive spasticity.
- Notably absent were extrapyramidal dyskinesia and epilepsy, common features of PCH.
- The older sibling exhibited additional features: high arched palate, triangular face, scoliosis, pectus carinatum, kyphosis, cubitus valgus, arachnodactyly, long extremities, and tall stature.
Findings:
- The observed clinical features in these siblings expand the known phenotypic spectrum of pontocerebellar hypoplasia.
- The presence of tall stature and specific skeletal anomalies in the older sibling are novel observations for PCH.
- The absence of epilepsy and extrapyramidal signs differentiates this presentation from some previously described PCH cases.
Implications:
- These findings necessitate an expansion of the clinical phenotype associated with pontocerebellar hypoplasia, especially for type II.
- Further case reports are crucial for a comprehensive understanding of PCH variability.
- Recognizing this expanded phenotype can aid in earlier diagnosis and improved genetic counseling for affected families.
Abstract:
We present two siblings with pontocerebellar hypoplasia who have progressive microcephaly, mental and motor retardation, truncal ataxia, strabismus, and progressive spasticity and hyperreflexia of the lower limbs. Extrapyramidal dyskinesia and epilepsy, other main clinical features of pontocerebellar hypoplasia, are absent. The older sibling also has a high arched palate, triangular-shaped face, thoracolumbar scoliosis, pectus carinatum, kyphosis, cubitus valgus, arachnodactyly, long extremities, and a tall stature, which were not previously reported in association with pontocerebellar hypoplasia. The clinical phenotype should be expanded, especially within type II, with the reports of additional cases.