BenignSoft tissue
Fibromatosis Colli
Synonyms: Sternocleidomastoid tumour of infancy
Neonatal SCM tumour - physiotherapy first-line
Quick Facts
Behaviour
Benign
Category
Soft tissue
Synonyms
Sternocleidomastoid tumour of infancy
Category
Soft tissue
Behaviour
Benign
Gender
M = F
Tissue of Origin
Fibrous
Epidemiology
- Benign fibromatosis of sternocleidomastoid muscle
- Neonates and infants (first 2–4 weeks of life)
- Associated with difficult delivery or birth trauma
- Equal sex distribution
Clinical Features
- Firm nodule in sternocleidomastoid muscle
- Torticollis
- Resolves spontaneously in most cases
Location
Sternocleidomastoid muscle
Imaging
- Ultrasound: echogenic mass within SCM
- MRI if diagnosis uncertain
Pathology
- Fibrous tissue replacing muscle fibres
- No atypia - reactive/post-traumatic
Genetics
Reactive - no defining mutation
Treatment
- Physiotherapy and observation - resolves in majority
- Surgery for persistent cases causing torticollis
Prognosis
- Excellent - most resolve by 6 months
- Residual torticollis may require physiotherapy
Key Points
- Neonatal SCM tumour - physiotherapy first-line
- Associated with birth trauma
- Resolves spontaneously in most - avoid unnecessary surgery
Workup - Blood Tests
None required
Workup - Local Imaging
Ultrasound of neck - diagnostic
Workup - Biopsy
Biopsy rarely needed
Workup - Staging
Not required
Medical disclaimer
The content on Sarcopedia is for educational and informational purposes only and does not constitute medical advice. It is not intended to be a substitute for professional medical diagnosis or treatment. Always consult with a qualified physician regarding any health concerns or before starting any new treatment. Reliance on any information provided on this site is solely at your own risk.