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Table 1 Modified Neer classification

From: Treatment of aneurysmal bone cysts using endoscopic curettage

Classification Description Details
A Healed Cyst filled with new bone with small radiolucent area (< 1 cm)
B Healed with a defect Radiolucent area (< 50% diameter) with enough cortical thickness
C Persistent cyst Radiolucent area (50% diameter) with thin cortical rim
D Recurrent cyst Cyst reappearing in the obliterated area or in the increased residual radiolucent area