Abstract：
OBJECTIVE: We aimed to describe the computed tomography (CT) and magnetic resonance (MR) imaging findings of intracranial extra-axial chondroma.
METHODS: We retrospectively evaluated the imaging findings of CT and MR examinations of six patients (three men and three women, aged 21-66 years) with histopathological diagnoses of intracranial extra-axial chondroma.
RESULTS: Four tumors were located in the frontal region and two in the cavernous sinus. All the tumors showed low signals on diffusion-weighted images and high signals on apparent diffusion coefficient maps without restricted diffusion. There was no perifocal edema in all the tumors. Cavernous sinus chondromas were associated with bone erosion and anterior displacement of the internal carotid arteries, but without calcification. Calcification was present in all frontal chondromas. All the tumors revealed low signals on T1-weighted MR images. Frontal chondromas revealed mixed signals, but cavernous sinus chondromas were brightly hyperintense on T2-weighted MR images. No enhancement was detected in the two chondromas. An intense homogeneous enhancement was detected in a cavernous sinus chondroma.
CONCLUSIONS: The imaging appearances of frontal extra-axial chondromas and cavernous sinus chondromas may have different imaging appearances. Although there is a wide range of imaging findings, the absence of restricted diffusion, perifocal edema, enhancement, and presence of low signals on T1-weighted MR images in a well-circumscribed calcified extra-axial mass should suggest an intracranial chondroma.
METHODS: We retrospectively evaluated the imaging findings of CT and MR examinations of six patients (three men and three women, aged 21-66 years) with histopathological diagnoses of intracranial extra-axial chondroma.
RESULTS: Four tumors were located in the frontal region and two in the cavernous sinus. All the tumors showed low signals on diffusion-weighted images and high signals on apparent diffusion coefficient maps without restricted diffusion. There was no perifocal edema in all the tumors. Cavernous sinus chondromas were associated with bone erosion and anterior displacement of the internal carotid arteries, but without calcification. Calcification was present in all frontal chondromas. All the tumors revealed low signals on T1-weighted MR images. Frontal chondromas revealed mixed signals, but cavernous sinus chondromas were brightly hyperintense on T2-weighted MR images. No enhancement was detected in the two chondromas. An intense homogeneous enhancement was detected in a cavernous sinus chondroma.
CONCLUSIONS: The imaging appearances of frontal extra-axial chondromas and cavernous sinus chondromas may have different imaging appearances. Although there is a wide range of imaging findings, the absence of restricted diffusion, perifocal edema, enhancement, and presence of low signals on T1-weighted MR images in a well-circumscribed calcified extra-axial mass should suggest an intracranial chondroma.
摘要：
目的：我们旨在描述颅内轴外软骨瘤的计算机断层扫描（CT）和磁共振（MR）成像发现。
方法：我们回顾性评估了6例患者（3例男性和3例女性，年龄21-66岁），具有颅内轴外软骨瘤的组织病理学诊断。
结果：四个肿瘤位于额区，两个位于海绵窦区。所有肿瘤在扩散加权图像上显示低信号，在表观扩散系数图上显示高信号，而没有限制扩散。所有肿瘤均无病灶周围水肿。海绵窦软骨瘤与骨侵蚀和颈内动脉前移位有关，但没有钙化.所有额叶软骨瘤均存在钙化。所有肿瘤在T1加权MR图像上显示低信号。额叶软骨瘤显示混合信号,但是海绵窦软骨瘤在T2加权MR图像上表现出明显的高强度。在两个软骨瘤中均未检测到增强。在海绵窦软骨瘤中检测到强烈的均匀增强。
结论：额轴外软骨瘤和海绵窦软骨瘤的影像学表现可能不同。尽管有广泛的影像学发现，没有限制的扩散，周围水肿,增强,在界限清楚的钙化轴外肿块中，T1加权MR图像上的低信号的存在应提示颅内软骨瘤。
方法：我们回顾性评估了6例患者（3例男性和3例女性，年龄21-66岁），具有颅内轴外软骨瘤的组织病理学诊断。
结果：四个肿瘤位于额区，两个位于海绵窦区。所有肿瘤在扩散加权图像上显示低信号，在表观扩散系数图上显示高信号，而没有限制扩散。所有肿瘤均无病灶周围水肿。海绵窦软骨瘤与骨侵蚀和颈内动脉前移位有关，但没有钙化.所有额叶软骨瘤均存在钙化。所有肿瘤在T1加权MR图像上显示低信号。额叶软骨瘤显示混合信号,但是海绵窦软骨瘤在T2加权MR图像上表现出明显的高强度。在两个软骨瘤中均未检测到增强。在海绵窦软骨瘤中检测到强烈的均匀增强。
结论：额轴外软骨瘤和海绵窦软骨瘤的影像学表现可能不同。尽管有广泛的影像学发现，没有限制的扩散，周围水肿,增强,在界限清楚的钙化轴外肿块中，T1加权MR图像上的低信号的存在应提示颅内软骨瘤。
