1. The head tilts to one side, and the chin faces the opposite shoulder. The oblique neck deformity is more obvious after 2~3 weeks. 2. Hard lump in the neck: Generally, a lump in the neck can be palpated after birth or within 2 weeks after birth, located in the middle and lower part of the sternocleidomastoid muscle on one side, and can be seen on the left and right sides. The lump is shuttle-shaped, no pressure pain, and usually reaches its maximum size after 1 to 2 months.
~Some of these children may have masses that do not disappear and produce muscle fibrosis and contracture, resulting in oblique neck deformity. 3. Asymmetry of face size: If congenital myotonic neck is not treated effectively in early stage, facial deformity will appear after 2 years of age, mainly manifested as facial asymmetry, asymmetry of the distance from the outer corner of the eyes to the corner of the mouth on both sides.
The distance from the outer corner of the eyes to the corner of the mouth is asymmetrical. The position of the affected eye plane decreases, and because the eyes are not at the same level, it is easy to produce visual fatigue and vision loss. The healthy side of the face is round and full, while the affected side is narrow and flat.
The affected side is narrow and flat. The cervical spine may have compensatory scoliosis. In addition, the whole face of the child, including the nose and ears, may also appear asymmetrical changes. 4. Restricted neck movement: The child’s head turning to the affected side is often affected, as shown by a smaller head turning to the affected side than to the opposite side, the lower jaw cannot be lifted, and the lateral flexion to the healthy side is restricted. These symptoms may be present from birth.
Some of these symptoms may disappear on their own without treatment.