Congenital muscular torticollis in infants: ultrasound-assisted diagnosis and evaluation.

Ultrasonography is considered the modality of choice for differentiating congenital muscular torticollis from other pathologies in the neck. The authors present their experience with ultrasound examination for the evaluation and management of congenital muscular torticollis. Twenty-six infants, 14 boys and 12 girls, age ranging from 1 to 16 weeks, with torticollis and a palpable mass were examined. Ultrasound showed a well-defined mass in the sternocleidomastoid muscle. The lesions ranged in size from 8 to 15.8 mm on maximal transverse diameter, with length ranging from 13.7 to 45.8 mm. Clinically the torticollis disappeared between 1 to 6 weeks, with complete clinical reduction of the palpated mass between 2 and 8.5 weeks. The ultrasonographic disappearance of the mass was delayed by an average of 2 weeks in comparison to the clinical disappearance of the mass. Ultrasound is advocated for the diagnosis and follow-up of congenital muscular torticollis because it noninvasively provides reliable and dynamic information without sedation.