Tsuchiya Mitsuteru, Masui Takayuki, Otsuki Yoshiro, Sakahara Harumi
1 Department of Radiology, Seirei Hamamatsu General Hospital , Hamamatsu, Shizuoka , Japan.
2 Department of Pathology, Seirei Hamamatsu General Hospital , Hamamatsu, Shizuoka , Japan.
Br J Radiol. 2018 Oct;91(1090):20170579. doi: 10.1259/bjr.20170579. Epub 2018 Jul 25.
: Mesenchymal chondrosarcoma (MCS) of the orbit is a rare and aggressive form of chondrosarcoma. The purpose of this study was to retrospectively identify the imaging features of mesenchymal chondrosarcoma of the orbit.
: This study included five patients with histologically confirmed MCS of the orbit who had undergone either CT, MRI, or both. Images were evaluated for the following: location, size, margin, CT density and presence or absence of calcification and/or ossification, MRI findings including dynamic contrast-enhancement and time-intensity curves.
: CT was performed in four of the five patients, and all four (100%) demonstrated calcification and ossification of the mass. MRI was performed in all five patients. In two patients (40%), the mass demonstrated areas of hyperintensity on T weighted images.
: The presence of a well-defined, orbital mass with calcification and ossification on CT and, marked heterogenous enhancement and a rapid-washout pattern on dynamic MRI indicate a high probability of MCS of the orbit. In addition, MCS of the orbit can demonstrate areas of hyperintensity on T weighted images, representing bone marrow fat tissue of ossification.
: MCS of the orbit is a highly malignant tumor, and early diagnosis by imaging is important. Radiologists should be aware of the imaging features of MCS of the orbit.
眼眶间叶性软骨肉瘤（MCS）是一种罕见且侵袭性强的软骨肉瘤形式。本研究的目的是回顾性确定眼眶间叶性软骨肉瘤的影像学特征。
本研究纳入了5例经组织学证实为眼眶MCS的患者，这些患者均接受了CT、MRI检查或两者都做了检查。对图像进行如下评估：位置、大小、边缘、CT密度以及有无钙化和/或骨化，MRI表现包括动态对比增强和时间-强度曲线。
5例患者中有4例进行了CT检查，所有4例（100%）均显示肿块有钙化和骨化。5例患者均进行了MRI检查。2例患者（40%）肿块在T加权图像上表现为高信号区。
CT上出现边界清晰、有钙化和骨化的眼眶肿块，以及动态MRI上明显的不均匀强化和快速廓清模式，提示眼眶MCS的可能性很大。此外，眼眶MCS在T加权图像上可显示高信号区，代表骨化的骨髓脂肪组织。
眼眶MCS是一种高度恶性肿瘤，通过影像学进行早期诊断很重要。放射科医生应了解眼眶MCS的影像学特征。
