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| MR imaging findings of the tumor-mimicking primary angiitis of the central nervous system |
| ZHENG Kui-hong1, MA Lin2, SHI Li-jing1, GUO Yong1, HUANG Min-hua1, ZHANG Yan-qun1, ZHAO Shu-chen1 |
| 1. Department of Radiology, Navy General Hospital, Beijing 100048, China;2. Department of Radiology, PLA General Hospital, Beijing 100853, China |
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Abstract Objective: To describe the MRI features of the tumor-mimicking primary angiitis of the central nervous system(PACNS) and to discuss MR diagnostic value of the tumor-mimicking PACNS. Materials and Methods: Eight patients with biopsy-proven PACNS mimicking brain tumor underwent MRI were reviewed. The findings of MR imaging were retrospectively analyzed and the clinical symptoms were also analyzed. Results: MR imaging demonstrated solitary mass in 6 cases, and multiple mass in 2 cases. On T1WI, the lesions showed homogeneous low signal in 3 cases, and mixed high and low signal in 5 cases. On T2WI, the lesions presented as homogeneous high signal in 3 cases and inhomogeneous high signal in 5 cases. All 8 cases with Gd-DTPA administration, marked enhancement was seen. All lesions of 8 cases showed mass-like enhancement. Conclusion: It is a difficult task to make the correct diagnosis of the tumor-mimicking PACNS, and this disease entity is often misdiagnosed as tumor by MRI. The comprehensive understanding of the MRI characteristic features would be helpful in diagnosing the tumor-mimicking PACNS, thus avoiding the devastating injury caused by surgery. The definite diagnosis relies on brain biopsy.
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Received: 12 March 2010
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2010, Vol. 21 
