A rare clinical image of fibromatosis colli on a 13-day-old baby

Fibromatosis colli (FC) is an uncommon pseudotumor of the sternocleidomastoid muscle, occurring with an incidence of 0.4%. It is often identified via ultrasonography between 2 and 4 weeks of age, with a higher prevalence in boys. It is categorized as a benign myofibroblastic tumour. A child about two weeks old with a unilateral sternocleidomastoid muscle hypertrophy is the typical presentation. The pathology seems to have a higher incidence in males. A 13-day-old boy was born via lower segment cesarean section (LSCS) breech presentation to a primi mother who was 31 weeks along in her pregnancy. After birth, the infant cried when stimulated and experienced mild respiratory distress and retractions; as a result, the baby was moved to the neonatal intensive care unit (NICU). Following ultrasound sonography (USG) results, fibromatosis colli is diagnosed.