Post-contrast delayed scan is the key of diagnosis and differential diagnosis.
增强延时扫描是诊断与鉴别诊断的关键。
Delayed scan, the hypodense edema ring enhanced and became isodense, or the abscess enhanced diffusely, the lesions became smaller and the colliquative necrosis area more obvious.
延时，脓肿周围低密度水肿环可强化为等密度，或脓肿内部强化，病变范围缩小，液化坏死区更显明显。
Enhanced and delayed ct scan not only showed what have been presented in the plain ct scans but also demonstrated 7 cases with external fistula of urine due to injury of collecting systems.
CT增强扫描和延时扫描不仅显示了平扫所见，而且还显示了肾脏收集系统损伤导致尿外渗7例。
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