Fibromatosis colli

Case contributed by Ashesh Ishwarlal Ranchod


Acute onset of torticollis and a firm, mobile, non-tender left neck mass.

Patient Data

Age: 11 weeks
Gender: Male

There is evidence of torticollis and no cervical malalignment or other congenital bony abnormality.


Dynamic ultrasound confirmed unilateral, left sternocleidomastoid muscle belly enlargement. There is a fusiform shape, with no discrete mass lesion, increased focal echogenicity corresponding to the enlarged muscle belly, and no calcifications or hematoma present. The contralateral asymptomatic right sternocleidomastoid muscle is normal.

Reactive age-appropriate anterior cervical chain benign lymphadenopathy is also present.

Case Discussion

This is a companion case to rID 99477 and was seen and diagnosed 1 day later in practice.

In this instance, the infant presents much earlier due to the early and acute onset of torticollis. The fibromatosis colli is left-sided, a less common site of occurrence in comparison to right-sided incidence. The clinical skeletal examination was normal with respect to possible hip or foot abnormalities.

The worried young mother was reassured and physiotherapy was to be initiated.

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