Related Experiment Videos
A muscle disorder as presenting symptom in a child with mucolipidosis IV
Insights
Mucolipidosis IV (ML IV) can present with severe psychomotor retardation, hypotonia, and corneal opacities. This case highlights the disease
Area of Science:
- Biochemistry
- Genetics
- Pediatrics
Background:
- Mucolipidosis IV (ML IV) is a rare lysosomal storage disorder.
- Typically diagnosed in early childhood with characteristic ocular and developmental features.
Observation:
- A patient initially diagnosed with an unspecified muscle disorder presented with psychomotor retardation, hypotonia, and bilateral corneal opacities.
- Muscle enzymes were elevated, with abnormal electromyograms and muscle biopsy findings.
Findings:
- ML IV was diagnosed 12 years later, revealing significant ocular and neurological deterioration.
- Persistently high enzyme levels were noted throughout the disease progression.
Implications:
- This case expands the understanding of ML IV's clinical spectrum, particularly its later-onset and muscle involvement.
- Highlights the importance of considering ML IV in cases with unexplained neurological and ocular symptoms, even with initial atypical presentations.
Abstract:
Psychomotor retardation and hypotonia were found in a 1 1/2 year old girl with bilateral corneal opacities. Very high levels of enzymes of muscular origin together with abnormal electromyograms and muscle biopsy lead at the time to the diagnosis of an unspecified muscle disorder. Twelve years later mucolipidosis IV (ML IV) was diagnosed in this child. She was then very retarded, ocular and neurologic deterioration were evident and enzyme levels were still very high. Only few patients affected with ML IV have been reported and all but one were very young; therefore it is important to add observations on the progression of the disease and on unusual clinical features like muscle involvement.