单房性骨囊肿中的 fallen fragment 征。 （注：此处“fallen fragment sign”可能是医学上一个特定的、有专业名称的体征，但仅根据所给英文不太能准确知道其确切中文表述，可根据实际医学知识进一步明确准确译名）
The fallen fragment sign in unicameral bone cyst.
作者信息
McGlynn F J, Mickelson M R, El-Khoury G Y
出版信息
Clin Orthop Relat Res. 1981 May(156):157-9.
PMID:7226646
Abstract
The roentgenographic findings in unicameral bone cyst may be difficult to differentiate from a solid tumor of bone. When present, the fallen fragment sign may aid in determining the roentgenographic diagnosis of unicameral bone cyst. In this finding, with a pathologic fracture a fragment of cortical bone may become dislodged and gravitate to the dependent portion of the unicameral bone cyst. Two examples of the fallen fragment sign demonstrate the displacement of a fragment of cortical bone to the dependent portion of the cystic cavity.
摘要
单纯性骨囊肿的X线表现可能难以与骨实体肿瘤相鉴别。若出现“陷落骨片征”，则有助于确定单纯性骨囊肿的X线诊断。在此表现中，病理性骨折时皮质骨碎片可能会脱落并下沉至单纯性骨囊肿的下垂部位。“陷落骨片征”的两个实例显示了皮质骨碎片向囊腔下垂部位的移位。
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