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Mitochondrial disorder mimicking ocular myasthenia
1Krankenanstalt Rudolfstiftung, Vienna, Austria, Europe. fifigs1@yahoo.de
Acta Neurologica Belgica
|June 3, 2010
Summary
Mitochondrial disorders (MID) can mimic ocular myasthenia (OM), especially with slow symptom progression. Challenging OM diagnosis is crucial if symptoms are atypical or unresponsive to medication.
Area of Science:
- Neurology
- Genetics
- Biochemistry
Background:
- Ocular myasthenia (OM) and mitochondrial disorders (MID) can present with overlapping symptoms, leading to diagnostic challenges.
- Early-stage MIDs may exhibit mild manifestations that mimic OM, complicating differential diagnosis.
Observation:
- A 69-year-old female initially diagnosed with OM at age 54 showed weak response to cholinergic medication and only marginally elevated antibodies.
- Further investigation revealed slightly elevated creatine-kinase, a maternal history of dementia, normal resting lactate, but an abnormal lactate-stress test.
- Muscle biopsy results were indicative of MID, with biochemical tests confirming a complex I defect.
Findings:
- Mitochondrial disorder (MID) can be misdiagnosed as ocular myasthenia (OM) due to similar initial presentations.
- Diagnostic criteria for OM require re-evaluation in cases with atypical features or poor response to standard treatment.
Implications:
- This case highlights the importance of considering MID in patients with suspected OM, particularly when clinical presentation is unusual.
- Comprehensive diagnostic workup, including genetic and biochemical testing, is essential for accurate diagnosis and appropriate management of patients with overlapping neurological symptoms.
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