Which dystonia presents with diurnal fluctuation, often worse in the late day, and improves with L-dopa?

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Multiple Choice

Which dystonia presents with diurnal fluctuation, often worse in the late day, and improves with L-dopa?

Dopa-responsive dystonia, also known as Segawa disease, is suggested by a pattern of diurnal fluctuation with symptoms that worsen as the day goes on and improve dramatically when levodopa is given. This usually begins in childhood and often starts with leg dystonia and gait disturbances. The diurnal variation happens because dopamine synthesis is impaired due to a genetic defect affecting the dopamine pathway, so exogenous levodopa supplies the missing dopamine and yields a pronounced, sustained improvement. Blepharospasm is a focal eyelid dystonia and typically does not show this daily fluctuation or a robust response to levodopa; it’s more often treated with botulinum toxin. Oromandibular dystonia involves the jaw and mouth and likewise lacks the classic diurnal pattern with strong levodopa responsiveness. Hemiballismus involves unilateral choreic movements usually from a vascular lesion and is not characterized by diurnal variation or consistent levodopa responsiveness.

Dopa-responsive dystonia, also known as Segawa disease, is suggested by a pattern of diurnal fluctuation with symptoms that worsen as the day goes on and improve dramatically when levodopa is given. This usually begins in childhood and often starts with leg dystonia and gait disturbances. The diurnal variation happens because dopamine synthesis is impaired due to a genetic defect affecting the dopamine pathway, so exogenous levodopa supplies the missing dopamine and yields a pronounced, sustained improvement.

Blepharospasm is a focal eyelid dystonia and typically does not show this daily fluctuation or a robust response to levodopa; it’s more often treated with botulinum toxin. Oromandibular dystonia involves the jaw and mouth and likewise lacks the classic diurnal pattern with strong levodopa responsiveness. Hemiballismus involves unilateral choreic movements usually from a vascular lesion and is not characterized by diurnal variation or consistent levodopa responsiveness.

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