Chondrolipoma is an extremely rare variant of lipoma with cartilaginous metaplasia. The presence of nonlipomatous components can lead to a variety of entities in the differential diagnosis from the radiologic findings. We describe an unusual case of a chondrolipoma occurring in the right ankle of a 9-year-old female. Physical examination showed a 3.5-cm, elastic-hard, poorly mobile, nontender mass adherent to the Achilles tendon. Plain radiographs revealed a faintly calcified soft tissue mass without bone involvement. Magnetic resonance imaging showed a well-defined mass with 2 components with heterogeneous signal intensity, suggesting the coexistence of a fatty area and another nonlipomatous component. Marginal excision of the tumor was performed. Histologically, the tumor was composed of mature adipose tissue studded with islands of mature hyaline cartilage. Based on these findings, the tumor was diagnosed as a chondrolipoma. The patient had no evidence of local recurrence within 9 months of follow-up. To the best of our knowledge, this is the first case of chondrolipoma originating from the ankle in a child.

译文

软骨脂肪瘤是脂肪瘤的一种极其罕见的变异型软骨化生。非脂肪瘤性成分的存在可导致放射学发现的鉴别诊断疾病中的各种实体。我们描述了一个9岁女性右脚踝发生软骨脂肪瘤的不寻常病例。体格检查显示跟腱附着有3.5厘米,弹性坚硬,移动不良,不柔软的肿块。X线平片显示微弱的钙化软组织肿块,没有骨受累。磁共振成像显示出一个明确的质量,其中有2个成分,信号强度不均匀,表明脂肪区域和另一种非脂肪瘤成分并存。进行了肿瘤的边缘切除术。从组织学上讲,肿瘤由成熟的脂肪组织组成,这些脂肪组织散布着成熟的透明软骨岛。根据这些发现,该肿瘤被诊断为软骨脂肪瘤。在随访的9个月内,患者没有局部复发的证据。据我们所知,这是第一例起源于儿童脚踝的软骨脂肪瘤。

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