非特异性肉芽肿性前列腺炎的MRI表现

目的：探讨非特异性肉芽肿性前列腺炎的MRI表现特点。方法：8例经病理证实的非特异性肉芽肿性前列腺炎患者行T1WI、T2WI、扩散加权成像（DWI）及增强检查，回顾性分析其临床及影像学表现特点。结果：8例患者病灶均为结节灶，以右侧前列腺中部外周带多见（5／8）。病灶在T。wI上呈低、稍低及等信号，T2WI上主要为低及稍低信号，DWI上表现为高及稍高信号，表观扩散系数（ADC）图上呈局灶性低信号。4例患者行动态增强MRI检查，病灶明显强化，时间一信号强度曲线呈Ⅰ型（1例）或Ⅱ型强化（3例）。结论：非特异性肉芽肿性前列腺炎的常规MRI检查缺乏特异性，而动态增强扫描可能有助于该病的诊断及鉴别诊断。

MRI findings of nonspecific granulomatous prostatitis

Objective：To evaluate MRI findings of nonspecific granulomatous prostatitis （NSGP）. Methods： Clinical and MR imaging findings of nonspeeific granulomatous prostatitis were retrospectively reviewed in 8 men confirmed by pa thology. Lesion shape, location and signal intensity （SI） were evaluated on T2-weighted imaging （T2WI）, diffusion-weighted imaging （DWI）, and dynamic contrast enhanced MRI （DCE-MRI）. Clinical findings and serum PSA levels were also evalua- ted. Results：Most lesions demonstrated slight hypo-intensity on T1WI and slight hypo-intensity on T2WI. On DWI, all le- sions （8/8） showed markedly high SI with decreased ADC value. Four cases showed enhancement after contrast injection in the cohort. The time-signal intensity curve （TIC） of NSGP showed a slow rise to a peak followed by a slow decline or a plateau （types Ⅰ andⅡ ）. Conclusion..Nonspecific granulomatous prostatitis has no signal specificity on conventional MR imaging,while dynamic contrast-enhanced MRI scans may be helpful in the diagnosis and differential diagnosis of the disease.