Congenital myotonic squint Congenital myotonic squint is a special postural deformity caused by contracture of the sternocleidomastoid muscle on one side, with the head deviating to the affected side and the jaw turning to the healthy side. The incidence is 0.3%~0.5%, and 80% occurs on the right side. Etiology:The direct cause is fibrosis of the sternocleidomastoid muscle, followed by contracture. Inadequate blood supply; hemorrhage from birth injury. Pathology:Sternocleidomastoid muscle in the middle and lower 1/3. It appears as a hard, round or oval mass resembling a soft fibroma with white cut surfaces, varying degrees of muscle tissue degeneration, fibrous tissue hyperplasia, and loss of muscle transverse lines. Clinical manifestations: 7-10 days after birth, the infant is found to have a bulging mass in the middle and lower third of the sternocleidomastoid muscle on one side of the neck, which is hard, round or oval in shape, with an irregular and movable base and no pressure pain. The head was deviated to the affected side, the jaw was turned to the healthy side, and the activity was restricted to varying degrees. After a period of time, the mass gradually disappears and a hard, striated sternocleidomastoid muscle appears, along with head and facial asymmetry. Treatment:For children within one year of age, massage and massage are used for manual correction. Persist for 6 months to a year. If non-surgical treatment is ineffective, surgery is performed above one year of age to sever the sternocleidomastoid muscle. 12 years of age or older is not ideal and is prone to diplopia. This article is published with the authorization of Dr. Wang Hefeng. The child was found to have a hard mass in the neck at one month of age, and a mass at the sternocleidomastoid muscle was seen on ultrasonography.