Ishibashi Takuya, Nishio Jun, Kobayashi Shunsuke, Shiramizu Kei, Yamamoto Takuaki
Resident, Department of Orthopaedic Surgery, Faculty of Medicine, Fukuoka University, Fukuoka, Japan.
Assistant Professor, Department of Orthopaedic Surgery, Faculty of Medicine, Fukuoka University, Fukuoka, Japan.
J Foot Ankle Surg. 2017 Nov-Dec;56(6):1284-1287. doi: 10.1053/j.jfas.2017.04.031. Epub 2017 Jun 9.
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.
软骨脂肪瘤是脂肪瘤的一种极其罕见的变异类型，伴有软骨化生。非脂肪瘤成分的存在会导致在鉴别诊断中根据放射学表现出现多种情况。我们描述了一例发生在一名9岁女性右踝部的不寻常软骨脂肪瘤病例。体格检查发现一个3.5厘米大小、质地硬且有弹性、活动度差、无压痛的肿块，附着于跟腱。X线平片显示一个轻度钙化的软组织肿块，未累及骨骼。磁共振成像显示一个边界清晰的肿块，有两种成分，信号强度不均匀，提示存在一个脂肪区域和另一个非脂肪瘤成分。对肿瘤进行了边缘切除。组织学检查显示，肿瘤由散在成熟透明软骨岛的成熟脂肪组织组成。基于这些发现，该肿瘤被诊断为软骨脂肪瘤。患者在随访9个月内无局部复发迹象。据我们所知，这是首例起源于儿童踝部的软骨脂肪瘤病例。
