Fibroplasia Ossificans Progressiva: A Case Report of a Rare Disease Entity

BACKGROUND: Fibrodysplasia ossificans progressiva (FOP), also known as Myositis ossificans progressiva or Munchmeyer's disease, is an extremely rare and disabling genetic condition of congenital skeletal malformations and progressive heterotopic ossification (HO). The disease is characterized by congenital skeletal anomalies and progressive ectopic bone formation in connective tissues such as ligaments, muscles and tendons. The disease has an incidence of about 1 in 2 million population. CASE DETAILS: We report a case of a 2-year and 8-month old male child with an initial diagnosis of soft tissue sarcoma based on fine needle aspiration (FNAC) of neck swelling. CONCLUSION: Fibroplasia ossificans progressive (FOP) characteristically manifests with bilateral malformation of the great toe and progressive heterotopic ossification (HO). Clinicians and radiologists should be aware of these to prevent permanent disability.