1. Neonatal. Also known as fibromatosis coli or fibroma of the sternocleidomastoid muscle. May present as a fibrous mass in a 2- to 8 week-old infant with a head tilt; occurs as a result of collagen and fibrous tissue deposition around atrophied muscle fibers of the sternocleidomastoid muscle.

2. Older children. Typically present with complaints of neck stiffness rather than neck mass.

I. Lymphoma (Hodgkin and non-Hodgkin), Rhabdomyosarcoma, and Other Malignant Tumors. Tend to be painless, solid, and fixed. Systemic symptoms may be present, but their absence should not rule out malignancy. In children 6 years of age or younger, the most commonly encountered tumors in the head and neck region include neuroblastoma, Hodgkin and non-Hodgkin lymphoma, and rhabdomyosarcoma. In older children, lymphoma, thyroid carcinoma, and rhabdomyosarcoma should be considered. Noninflammatory (tumoral) adenopathy may be seen in children with leukemia or lymphoma.

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