<prompt> Hematoma of the sternomastoid muscle detected in a 16 days old infant requires:Immediate surgical evacuationSurgical intervention within 2 weeksProphylactic antibiotic therapyNo immediate therapy  <response>: Sternomastoid tumourHematomaPresents at about 7-10 days after birthSituated at the junction of upper and middle third of the muscleEtiology: rupture of sternocleidomastoid muscle fibres and blood vessels, due to: hematoma and cicatricial contracture Difficult breech delivery Attempted delivery after shoulder dystocia Excessive lateral flexion of neck following normal delivery.Clinical features: Transient torticollisTreatment: No treatment required, disappears spontaneously by 6 months of age Gentle movements and stretching of muscle done after feeds is useful Do not massage. 