少见部位软骨母细胞瘤的影像诊断

目的:探讨少见部位软骨母细胞瘤的影像学表现及其临床诊断价值。方法:回顾性分析经病理证实的7例少见部位软骨母细胞瘤患者的病例资料。肿瘤位于距骨2例、跟骨2例、髌骨、坐骨结节及耻骨下支各1例。行X线平片检查7例,CT平扫4例,MRI平扫及增强检查4例。结果:X线平片示膨胀性骨质破坏5例,囊状骨质破坏1例,灶周硬化3例,病灶内小斑片状钙化1例;平片漏诊1例。4例CT均显示膨胀性骨质破坏,灶周硬化,病灶内斑点状或小斑片状钙化。MRI上病变呈膨胀性骨质破坏3例,囊状骨质破坏1例,4例病灶信号均混杂,灶周均可见低信号线状影及明显的骨髓水肿。结论:少见部位软骨母细胞瘤具有膨胀性骨质破坏及灶周骨髓水肿明显的特点,平片、CT和MRI三种检查方法联合应用对本病的诊断及鉴别诊断有重要价值。

Imaging diagnosis of chondroblastoma in unusua.l locations

Objective：To investigate the imaging features and their value in the diagnosis of chondroblastoma in unu- sual locations. Methods：The clinical materials of 7 cases with pathology proved ehondroblastoma in unusual locations were retrospectively analyzed, involving talus （n= 2）, calcaneus （n = 2）, patella, ischial tuberosity and inferior ramus of pubis for one case each. In these 7 patients, plain radiography （n= 7）, computed tomography （n~ 4） and magnetic resonance imaging （n= 4） were performed. Results：Expansive bone destruction （n= 5） and cystic bone destrution （n= 1） were assessed on ra- diography,also patchy sclerosis around the lesion （n= 3） and intra-tumoral spotty calcifications （n= 1）. Of the 4 cases un- dergone CT,there were expansive bone destruction, patchy sclerosis around the lesion and intra-tumoral patchy or spotty calcifications. Expansive bone destruction were showed in 3 cases on MRI with heterogeneous signal intensities, peripheral linear hypo-intensity and obvious bone marrow edema. ConcluSion：Imaging features of chondroblastoma in unusual locations included expansive destruction of bone, and peripheral bone marrow edema. Combined utilization of plain films,CT and MRI is helpful for the diagnosis and differential diagnosis of chondroblastoma in unusual locations.