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Rotatory spasm

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rotatory spasm --> spasmodic torticollis

A disorder of unknown cause, manifested as a restricted dystonia, localised to some of the neck muscles, especially the sternomastoid and trapezius; occurs in adults and tends to progress slowly; the head movements increase with standing and walking and decrease with contractual stimuli, e.g., touching the chin or neck.

Synonym: dystonic torticollis, rotatory spasm, rotatory tic.