Congenital myotonic neck is commonly known as “crooked neck”. The mechanism of its occurrence is still unclear. Most scholars believe that this disease is mostly related to hematoma mechanization, atrophy, fibrotic scar formation and muscle contracture of the sternocleidomastoid muscle caused by abnormal delivery and birth injury; blockage of the supply vessels of the sternocleidomastoid muscle on one side may also lead to degenerative changes of the muscle fibers, resulting in a squint; in addition, intrauterine and extrauterine infections and genetics are also related to the development. In the neonatal period, congenital sternocleidomastoid muscle mainly manifests as a hard mass in the sternocleidomastoid muscle on the affected side of the neck, which is inactive; around 2 months, the mass shrinks and gradually disappears, and the sternocleidomastoid muscle on the affected side becomes fibrotic and contracted, pulling the head and occiput to the affected side and turning the jaw to the healthy shoulder. As the disease progresses, the affected side gradually deforms and atrophies, with asymmetry on both sides; and strabismus may appear; when the deformity is serious, the affected shoulder rises, and the cervical spine undergoes morphological and structural changes. Early diagnosis and early treatment of this disease have remarkable effects. When facial atrophy, strabismus and cervical spine deformation occur, surgery can correct the strabismus, but the recovery of other deformities is difficult. The current treatment mainly includes conservative treatment and surgical treatment. Conservative treatment is mainly local physical therapy and is suitable for infants and children within 1 year old. Surgical treatment is suitable for children over 1 year old; now that minimally invasive treatment methods are available, the age of surgery can be appropriately advanced. Traditional open surgery requires a long transverse incision in the neck, which is more traumatic, slower to recover, and leaves a larger scar after surgery, which is one of the reasons why many parents are reluctant to choose surgery. In recent years, with the development of lumpectomy technology, its role and advantages in the treatment of oblique neck have become more and more obvious. A small incision of 5 mm is made in the anterior wall of the axilla on the affected side along the dermatome, a trocar and cavernoscope are placed, a subcutaneous tunnel is established to the neck, the surgical space is inflated, small holes of 2-3 mm are poked in the neck and the dermatome on both sides of the sternocleidomastoid muscle, an operating forceps and a fine-tipped electric knife are placed, and the sternal and clavicular heads of the sternocleidomastoid muscle and the tense soft tissue are severed layer by layer until the muscle is completely relaxed; care is taken not to damage the The cervical vascular sheath should not be damaged. After the operation, the gas was discharged and the wound was glued with medical tissue adhesive without stitches. After the operation, the wound can be discharged after 3 days of observation without stitching; according to the condition, continue to wear a neck brace or orthopedic brace after the operation and continue functional exercise. The axillary wound is hidden, and the neck wound is not visible after 1-2 months, which has excellent cosmetic effect. Minimally invasive treatment of congenital myotonic neck under lumpectomy is gradually accepted by patients and parents because of its small trauma, quick recovery and no scarring of the neck. It should be emphasized that although this procedure is minimally invasive, there is a risk of injury to the large blood vessels and nerves in the neck if the operation is not performed carefully, and the operator should have some experience in open neck surgery and extensive experience in lumpectomy.