Location:Metaphyseal,central.
Age:Children(6-10).
Pattern of bone destruction:Geographic type 1 b-lytic lesion
D.D. according to location and age
-Fibrous dysplasia.
-Pyogenic osteomyelitis.
-Enchondroma
-Simple bone cyst.
Discussion:The pattern of bone destruction (geographic) can exclude pyogenic osteomyelitis,while appearance as a lytic lesion could exclude enchondroma due to abscense of chondral matrix,also abscense of internal septation could exclude fibrous dysplasia.
Diagnosis:Simple bone cyst.
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