Firmness over distribution of the left sternocleidomastoid ?Lymph node ?Branchial cyst.
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Left sternocleidomastoid is diffusely and asymmetrically enlarged comapred to the right. No discrete mass or cervical lymphadenopathy.
Typical appearances of fibromatosis colli (sternocleidomastoid pseudotumour). At the time of scanning the patient's parents reported that the mass had decreased in the preceding weeks.