Her mother came complaining that her daughter has a lump in the right side of the neck with a history of a complicated vaginal delivery.
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The right sternocleidomastoid muscle shows a diffusely fusiform thickening and shortening.
The left sternocleidomastoid is unremarkable.
Fibromatosis colli typically presents with a neck swelling at 1-2 months after birth, most commonly as a result of a complicated vaginal delivery and always came with head tilt to the affected site and neck mass.
Ultrasound imaging is the imaging modality of choice in diagnosing fibromatosis colli.