García-Díez A I, Ros Mendoza L H, Villacampa V M, Cózar M, Fuertes M I
Department of Radiology, Hospital Miguel Servet, Zaragoza, Spain.
Eur Radiol. 2000;10(3):462-6. doi: 10.1007/s003300050077.
Infestation in soft tissue by Echinococcus granulosus is not a common disease, and its diagnosis is based on clinical, laboratory data and radiological findings. The aim of our retrospective study is to give an overview of the different signs and patterns shown by MRI that can be useful in characterizing soft tissue hydatid disease. The MRI images obtained in seven patients with soft tissue and subcutaneous hydatidosis were reviewed. Typical signs of hydatidosis were multivesicular lesions with or without hypointense peripheral ring ("rim sign"). Related to the presence and absence, respectively,of viable scolices in the microscopic exam, daughter cysts were presented either as high signal intensity or low signal intensity on T2-weighted images. Low-intensity detached layers within the cyst and peripheral enhancement with gadolinium-DTPA were also presented. Atypical signs were presented in an infected muscular cyst, a subcutaneous unilocular cyst and several unilocular cysts. Knowledge of the different patterns in MRI of soft tissue hydatid disease can be useful in diagnosing this entity. We observed that the "rim sign" is not as common as in other locations, and in addition, MRI seems to be of assistance when evaluating the vitality of the cysts.
细粒棘球绦虫引起的软组织感染并非常见疾病，其诊断基于临床、实验室数据及影像学表现。我们这项回顾性研究的目的是概述MRI所显示的不同征象和模式，这些对软组织包虫病的特征性描述可能有用。我们回顾了7例软组织及皮下包虫病患者的MRI图像。包虫病的典型征象为多房性病变，有或无低信号的周边环（“边缘征”）。根据显微镜检查中活头节的有无，子囊在T2加权图像上分别表现为高信号强度或低信号强度。囊肿内还可见低强度分离层以及钆喷酸葡胺增强后的周边强化。非典型征象出现在一个感染性肌囊肿、一个皮下单房囊肿以及几个单房囊肿中。了解软组织包虫病MRI的不同模式有助于诊断该病。我们观察到“边缘征”并不像在其他部位那样常见，此外，MRI在评估囊肿的活性时似乎有帮助。
