Fact-sheet: Fibromatosis colli

Updated on 09/30/2019 at 4:36 PM

Note : 0/10

Definition

Congenital muscular pseudotumor: incidence 0.3% to 2%

Firm, fibrous, non-inflammatory lesion discovered a few weeks after birth in an infant with a history of birth trauma.
Etiology: uncertain; the most widely accepted theory is traumatic tearing during delivery
Rarely bilateral; spontaneously resolves favorably within a few weeks to months in the vast majority of cases. Right side > left
A possible association with developmental hip dysplasia or foot malposition suggests an asymmetric postural syndrome

IMAGING NOT ESSENTIAL FOR DIAGNOSIS

In the absence of a muscular abnormality, obtain a cervical spine radiograph (to look for a vertebral anomaly)

Lateral neck mass, predominantly right-sided, with torticollis and head deviation to the opposite side

Fusiform thickening of the sternocleidomastoid muscle, hyperechoic compared with the contralateral muscle, with preserved fibrillar pattern

No medical or surgical treatment other than postural advice

Progressive regression of the mass over approximately 4 months