慢性病灶有收缩感，边缘较锐利，信号较均匀，周围无晕环征象，增强后无强化。
The chronic lesions had an appearance of shrinking, sharp edge, even signals, and had no lunar circle phenomena and obvious enhancement.
MR 影像上，在T1序列上中央坏死显示中度强度的信号，T2序列上呈低信号，增强扫描有强化。
On MR images, the necrotic center of the nodes will show intermediate signal intensity on T1-weighted images, low signal intensity on T2-weighted images, and will enhance with contrast.
增强扫描等信号环强化。
The middle signal rings were enhanced on post-contrast images.
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