A growing amount of evidence indicates that 22q11.2 deletion syndrome (22q11.2DS) increases the risk of early-onset Parkinson's disease (EOPD). Here, we describe a 36-year-old patient with EOPD. The patient presented with 22q11.2DS features, including associated cognitive disabilities, hypocalcaemia and facial dysmorphia that led us to screen for and confirm this deletion. In addition, hypocalcaemia and vitamin D deficiency were the main factors responsible for severe, painful muscle spasms that were non-levodopa (L-Dopa) responsive and remitted after calcium and vitamin D replacement therapy. Many patients with this deletion remain undiagnosed until adulthood due to the absence of 'major' phenotypic hallmarks, which usually present during early childhood. Later onset problems involving various medical subspecialties are increasingly recognised as important components of 22q11.2DS. Therefore, the multisystem nature and associated burden of morbidities demand a high degree of suspicion for this entity from all clinicians regardless of their medical subspecialty.
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