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Fibrodysplasia ossificans progressiva: a distinctive bone-forming lesion of the soft tissue
Insights
This case study details a rare bone-forming soft tissue lesion in a child, later diagnosed as fibrodysplasia ossificans progressiva (FOP). The condition caused progressive jaw ankylosis and skeletal abnormalities.
Area of Science:
- Medical Genetics
- Orthopedics
- Pathology
Background:
- Fibrodysplasia ossificans progressiva (FOP) is a rare genetic disorder characterized by progressive heterotopic ossification.
- Early diagnosis and understanding of FOP's clinical manifestations are crucial for patient management.
Observation:
- A 3-month-old infant presented with a soft tissue bone-forming lesion on the cheek, accompanied by phalangeal abnormalities.
- The lesion led to progressive temporomandibular joint ankylosis, severely limiting jaw mobility.
- Histological examination revealed features consistent with membranous bone formation, resembling periosteal grafts.
Findings:
- The patient was diagnosed with fibrodysplasia ossificans progressiva (FOP) based on clinico-pathologic features.
- Mineral metabolism and endocrine functions were found to be within normal limits.
- The differential diagnosis considered other bone-forming lesions, including myositis ossificans and extra-skeletal osteosarcoma.
Implications:
- This case highlights the importance of recognizing the diverse presentations of FOP.
- Understanding the progressive nature of FOP is vital for managing associated complications like jaw ankylosis.
- Further research into FOP pathogenesis and treatment is warranted to improve patient outcomes.
Abstract:
A 3-month-old white female presented with a bone-forming lesion of the soft tissue of the left cheek. Skeletal survey revealed numerous associated radiographic abnormalities, predominantly involving the phalanges. Mineral metabolism and endocrine function were within normal limits. Multiple operations were performed over a 17-year period for palliation of sequelae arising from inability to open the mouth due to ankylosis of the temporomandibular joint by the progressively ossifying lesion. Histologically, the pathologic material had features resembling those of periosteal grafts, with all stages of membranous bone formation and a tendency for more mature lesions later in the course. .The clinico-pathologic features are those of fibrodysplasia ossificans progressiva (FOP). The differential diagnosis of this rare condition from other bone-forming lesions of the soft tissue such as myositis ossificans, extra-skeletal osteosarcoma and osseous metaplasia is discussed.