Tumors of the sternocleidomastoid muscle.
D006258:Head and Neck Neoplasms; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases; D009334:Neck Muscles; D009369:Neoplasms
INFANT, NEWBORN/diseases; NECK/neoplasms