Fibrous Dysplasia

Fibrous dysplasia
-Fibrous dysplasia is a benign disorder characterized by tumor-like proliferation of fibro-osseus tissue and can look like anything.
-FD most commonly presents as a long lesion in a long bone.
-FD is often purely lytic and takes on ground-glass look as the matrix calcifies.
-In many cases there is bone expansion and bone deformity.
-The ipsilateral proximal femur is invariably affected when the pelvis is involved.
-When FD in the tibia is considered, adamantinoma should be in the differential diagnosis. Discriminator:
If periosteal reaction or pain is present, exclude fibrous dysplasia, unless there is a fracture.


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Fibrous Dysplasia

Age:Young girl-23 years old.

Complaint: Pain in the right shoulder.

Type of examination:X-ray right shoulder.

Findings:

1-Location:Metaphyseal,diaphyseal and seems to be central.

2-Type of bone destruction:Geographic(type 1 b).

2-Type of lesion:Lytic lesion with Multiple septae are visible and outer cortical rim of the bone is maintained, suggesting a benign pathology.

3-Periosteal reaction:No periosteal reaction.

D.D. according to location as follow

-Enchondroma:In long bone usually shows chondral calcification.

-Pyogenic osteomyelitis:Usually shows permeative pattern rather than geographic.

-Simple bone cyst.

-Fibrous dysplasia.

Diagnosis:Fibrous dysplasia.