Department of Radiology, Beijing Tongren Hospital, Capital Medical University, No. 1, Dongjiaominxiang, Dongcheng District, Beijing 100730, China.
Eur J Radiol. 2012 Nov;81(11):3450-5. doi: 10.1016/j.ejrad.2012.05.010. Epub 2012 Jun 4.
To determine the CT and MR imaging features of ossifying fibroma with aneurysmal bone cyst of the paranasal sinus.
We retrospectively reviewed 15 patients with histopathology-proven ossifying fibromas with aneurysmal bone cysts in the paranasal sinus. All 15 patients underwent CT and MR imaging. The following imaging features were reviewed: location, shape, margin, CT findings, and MR imaging appearances and time-intensity curve of dynamic contrast-enhanced MR imaging.
Ossifying fibromas occurred in the maxillary sinus in one patient, sphenoid sinus in 2, frontal sinus in 3, frontoethmoid sinuses in 3, and ethmoid sinus in 6 patients. Ossifying fibromas showed an elliptic-shape and aneurysmal bone cysts revealed a multicystic appearance, with well-demarcated margins. On unenhanced CT, ossifying fibromas appeared isodense to gray matter with scattered calcifications in nine, ground-glass appearance in 6 patients and aneurysmal bone cysts showed mixed density. Ossifying fibromas appeared isointense to gray matter in 12 and slightly hypointense in three patients on T1-weighted images, and isointense in 4 and hypointense in eleven patients on T2-weighted images, with moderate or marked enhancement after administration of contrast material. The time-intensity curves of eight ossifying fibromas exhibited a rapidly enhancing and rapid washout pattern. The intracystic components of aneurysmal bone cysts showed heterogeneous signal intensity on MR images, with fluid-fluid levels identified clearly by T2-weighted images, without enhancement. The periphery and septa of aneurysmal bone cysts appeared isointense on MR images, with marked enhancement.
Fluid-fluid levels within an elliptic-shape mass with scattered calcifications or ground-glass appearance is highly suggestive of this complicated entity in the paranasal sinus.
确定鼻窦骨化性纤维瘤伴动脉瘤样骨囊肿的 CT 和 MR 成像特征。
我们回顾性分析了 15 例经组织病理学证实的鼻窦骨化性纤维瘤伴动脉瘤样骨囊肿患者。所有患者均行 CT 和 MR 成像检查。回顾分析了以下影像学特征：位置、形态、边缘、CT 表现、MR 成像表现及动态增强 MR 成像时间-信号强度曲线。
1 例患者病变位于上颌窦，2 例位于蝶窦，3 例位于额窦，3 例位于额筛窦，6 例位于筛窦。骨化性纤维瘤呈椭圆形，动脉瘤样骨囊肿呈多囊状，边界清楚。平扫 CT 上，9 例骨化性纤维瘤呈等密度，伴散在钙化，6 例呈磨玻璃样密度，动脉瘤样骨囊肿呈混杂密度。T1WI 上 12 例骨化性纤维瘤呈等信号，3 例呈稍低信号，T2WI 上 4 例呈等信号，11 例呈低信号，增强后呈中度或明显强化。8 例骨化性纤维瘤的时间-信号强度曲线呈快速增强、快速廓清的特点。动脉瘤样骨囊肿的囊内成分在 MR 图像上呈不均匀信号强度，T2WI 上可清楚显示液-液平面，无强化。动脉瘤样骨囊肿的外周和分隔在 MR 图像上呈等信号强度，明显强化。
鼻窦内呈椭圆形、伴散在钙化或磨玻璃样密度的混杂密度肿块，其内可见液-液平面，提示该病变为鼻窦内复杂病变。
