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Congenital ocular motor apraxia
Insights
Congenital ocular motor apraxia (COMA) involves motor and speech delays. Associated brain abnormalities may indicate early CNS maldevelopment, not be integral to COMA.
Area of Science:
- Neuroscience
- Pediatric Neurology
- Ophthalmology
Background:
- Congenital ocular motor apraxia (COMA) is a rare neurological disorder affecting eye movements.
- Understanding its natural history and associated conditions is crucial for diagnosis and management.
Observation:
- Nine patients with COMA were studied, with two diagnosed in infancy before characteristic head thrusts.
- All patients exhibited initial motor delays that partially resolved, and conceptual/speech delays in early childhood.
Findings:
- Associated neurological findings included agenesis of the corpus callosum in three patients and cerebellar abnormalities in two.
- Autopsy revealed cerebellar cortical dysplasia in one infant.
Implications:
- The pathogenesis of COMA remains unclear.
- Cerebellar and corpus callosum abnormalities may be markers of broader central nervous system (CNS) maldevelopment rather than direct causes of COMA.
Abstract:
Nine patients with congenital ocular motor apraxia (COMA) are presented and the natural history of this condition is considered. Two presented in early infancy, before the onset of the head thrust, and the means of establishing the diagnosis at this age are discussed. All exhibited motor delay in infancy which lessened, but did not completely resolve, with time. Conceptual delay, particularly with speech, affected all in early childhood. Three had agenesis of the corpus callosum and 2 cerebellar abnormalities. The autopsy of one infant showed cerebellar cortical dysplasia. The pathogenesis of COMA remains unknown and it is possible that agenesis of the corpus callosum and cerebellar hypoplasia are markers indicative of early CNS maldevelopment and not an integral part of the mechanism of COMA.