 | This radiograph reveals a pathological fracture with marked varus deformity through a large osteolytic subtrochantric lesion that suggests the presence of a Unicameral Bone Cyst. The edges of the lesion show a rim of bone that indicates slow growth and a benign lesion. The principles of treatment include establishing the diagnosis by biopsy, and then reducing and internally fixing the fracture, correcting the angular deformity and the shortening. Also included is curettage and bone grafting.
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 | This segment of bone removed for biopsy purposes performed ten days after the pathological fracture, reveals a portion of metaphyseal bone, a small segment of the epiphyseal plate (EP) of the greater trochanter and a thickened portion of the bone cyst lining (BCL).
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 | Higher power views of the bone cyst lining. |
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 | This demonstrates the cyst lining in the cancellous bone. |
 | This radiograph reveals the corrected angular deformity fixed with a Jewett nail plate. The cyst was also curetted and packed with autogenous bone grafts.
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 | All of the hardware was removed at about 2.5 years. This radiograph made seven years after initial treatment demonstrates the bone cyst to be healed in a normally aligned femur. The only residual is a slight asymptomatic femoral neck shortening.
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