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Increase in size and involve the entire bone
2%
34/1557
Decrease in size and may disappear altogether
85%
1321/1557
Turn into a malignant tumor
0%
7/1557
Remain unchanged
11%
175/1557
Lead to deformity of the affected bone
1%
15/1557
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The lesion depicted in Figure A is unicameral bone cyst (UBC), a benign tumor typically seen in the ends of long bones(Illustration A) in the skeletally immature. UBCs can also occur in the tarsal bones of the foot. The cyst usually progressively shrinks as the patient approaches skeletal maturity and may heal spontaneously after growth is completed. Smith and Smith reviewed 20 cases of pediatric calcaneal UBCs over 20 years. Half were treated operatively with curretage and bone grafting. The non-operative group did well and after 20 years most of the UBCs healed completely. Those that didn't heal did not progress.
3.3
(21)
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