Sternocleidomastoid Tumor (Clinical Findings)

1.5-month-old boy with a mass in the region of or along the right sternocleidomastoid muscle. There is no visible torticollis, although this pathology belongs to the forms of congenital muscular torticollis. The mass is neither a neoplastic tumor nor a hematoma within the muscle after a birth trauma. The mass is a reaction within the sternocleidomastoid muscle following an intrauterine compartment syndrome which disappears within 1 to 2 months.