儿童胫骨近端局灶性纤维软骨发育不良6例影像表现

目的：探讨儿童胫骨近端局灶性纤维软骨发育不良（Focal Fibrocartilagions Dysplasia，FFCD）的影像表现。方法：6例经手术病理证实为 FFCD，对 X 线及 MRI 表现进行分析，总结 FFCD 的 X 线及 MRI 特点。6例病例中，男性5例，女性1例，4例位于左侧胫骨近段干骺端内侧，2例位于左侧胫骨近段干骺端内侧。结果：6例患儿 X线均表现为患侧胫骨近端呈内翻改变，内侧骨皮质局部凹陷，可见条带状斜行透亮区，边界清晰，内侧骨质均可见明显硬化。在 MRI 上表现，6例患儿表现为胫骨近端条带状异常信号影，T1WI 呈低信号，T2WI 呈低信号，边界清晰，与 X 线上骨质缺损区对应；胫骨内侧可见带状长 T1中等 T2信号，与 X 线上骨质硬化对应；其中2例病变周围骨髓出现水肿。3例行增强扫描患儿病变未见强化。结论：FFCD 是罕见的良性病变，以儿童多见，病变部位主要位于长骨，尤其是胫骨近端干骺端内侧，FFCD 在 X 线及 MRI 上具有特征性，依据这些特点可作出较准确的诊断。

Imaging characteristics of focal fibrocartilaginous dysplasia in young children with tibia vara

Objective To explore the imaging characteristics of focal fibrocartilaginous dysplasia in young child with tibia vara. Methods Analyze the X-ray and MRI images of 6 cases which were confirmed as focal fibrocartilaginous dysplasia by surgery and pathology. The medical imaging features of focal fibrocartilaginous dysplasia were summarized. In the total 6 cases (including male=5, female=1), 3 of them occurred in the left tibia, another 3 cases occurred in the right tibia. FFCD occurred on the left tibia. Results Radiographically, these lesions were characterized by a well-defined lucent defect in the 6 cases, there was sclerosis along the lateral border of the lesion, and superior-medially, there was an absent bone margin. The MRI findings were virtually identical in all cases. Areas corresponding to the cortical lucency on plain films were hypointense on T1WI and T2WI, while the areas corresponding to the distal sclerosis were hypointense on T1WI and intermediate on T2WI without en-hancement. 2 cases appeared the marrow edema surrounding the lesions. Conclusion Focal fibrocartilaginous dysplasia is an uncommon, benign bone lesion that caused deformity of the tibia in young children. However, Focal fibrocartilaginous dysplasia can be diagnosed accurately based on the typical features displayed on X-ray and MRI.