LAUSR

Congenital muscular torticollis (CMT) involves tilting of the head ipsilateral to the shortened sternocleidomastoid muscle. Most patients are identified in childhood and new diagnosis in adults is rare.1 The role of MRI in CMT is not well defined.2 Here we present a 38-year-old man with a history of limited neck mobility since childhood and no previous therapies who was recently diagnosed with CMT. Subsequent treatments with 750 U of abobotulinumtoxinA did not provide benefit. CMT needs to be differentiated from idiopathic cervical dystonia. MRI can confirm muscle structural changes in adult patients, confirming the diagnosis of CMT (Figure).