卵巢甲状腺肿的CT与MRI诊断

CT and MRI Features of Struma Ovarii

目的卵巢甲状腺肿(SO)临床罕见,本文总结其CT和MRI特征。资料与方法回顾性分析6例经手术和病理证实的SO患者的影像学资料,其中4例行CT平扫及增强扫描,2例行MR平扫及增强扫描。结果 (1)CT表现:均为单侧囊实性肿块,形态不规则,1例与子宫有粘连,增强扫描后实性成分及囊壁强化明显,实性成分强化形式类似甲状腺组织,囊液无强化。(2)MRI表现:均为单侧囊性成分为主的肿块,形态较规则,边界清楚,囊内可见多个分隔,囊性成分信号复杂,实性成分T1WI、T2WI等信号为主,增强扫描后囊液无强化,囊壁、分隔及实性成分强化明显。结论 SO的CT和MRI表现有一定的特征性,主要表现为多分隔的囊实性肿块,在CT上分隔处可见钙化灶,MRI信号复杂,其实性成分强化形式与甲状腺组织类似为特征性表现,对其诊断和鉴别诊断有重要意义。

Purpose To summarize the CT and MRI manifestations of rare disease struma ovarii（SO）. Materials and Methods CT and MRI findings of six cases of SO confirmed by pathology were analyzed and summarized retrospectively. Four of six patients underwent pre- and post-contrast CT scan, while the other two patients underwent pre- and post-contrast MR scan. Results 1 CT findings： all of the four cases showed unilateral, cystic-solid masses with irregular shape. One lesion was adhesive with uterus. The solid component and the cyst wall enhanced marked after administration of contrast media, and density of the enhanced solid component were similar to normal thyroid tissues, while the cystic part showed no enhancement. 2 MRI findings： both of two cases were unilateral, cystic lesions with clear border and regular shape. There were multiple septa in the lesions. The signal intensity of the cystic part was complex and solid part showed iso-intensity on both T1 WI and T2 WI. Cyst wall and interval enhanced significantly. The cystic portions showed no enhancement. Conclusion SO has some characteristic CT and MRI findings of a cystic-solid mass with multiple septa. Calcification may be seen at the septa on CT images. Cysts portion shows variable signal intensities, and enhancement of solid component is similar to thyroid tissues.