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A 6-week-old female infant presents with the neck deformity and palpable mass shown in Figure A. She has had persistent lateral tilting of her head to the right since birth, and rotation of the neck is restricted. In this age group, what is the most common cause of this rotational abnormality?
Congenital muscular torticollis
Atlantoaxial rotatory displacement
Paroxysmal torticollis of infancy
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Tightness in which of the following muscles has been implicated as an etiology for congenital muscular torticollis?