嗜铬细胞瘤的MRI诊断与鉴别诊断

目的探讨嗜铬细胞瘤的MRI诊断与鉴别诊断。方法收集53例经手术病理证实的嗜铬细胞瘤，术前均行MRI扫描，回顾性分析其MR征象。结果53例嗜铬细胞瘤，共59个病灶。单发48例，其中42个位于肾上腺，右侧26个，左侧16个；异位6个。多发5例，均位于肾上腺，双侧各1个，并其中1例左侧术后复发。良性47例，恶性6例。嗜铬细胞瘤呈较大的类圆形或不规则形肿块（平均瘤径5．7cm），T1WI信号强度类似肝实质，T2WI信号较高，肿瘤实体部分多明显强化（40／59），易发生坏死、囊变（36／59）。结论MRI检查可较好地显示肿瘤部位、形态、大小、瘤内成分、血供和与周围结构的关系，对嗜铬细胞瘤的诊断和鉴别诊断具有重要价值。

MRI diagnosis and differentiation of pheochromocytoma

Objective To investigate the MRI diagnosis and differentiation of pheochromocytoma. Methods 53 cases with pathologically-proved pheoehromocytoma were collected. MRI scanning was performed in all cases before surgery. And the MRI findings of all pheoehromoeytorna were retrospectively analyzed. Results 59 tumors were shown in 53 cases. 48 cases were single pheoehromocytoma, and 42 tumors were adrenal pheoehromoeytorna with 26 from right adrenals and 16 from left adrenals; 6 tumors were extra-adrenal pheoehromoeytoma. 5 cases were bilateral pheochromocytoma, and 1 rumor relapsed from left adrenal after surgery. 47 cases were benign pheoehromoeytoma, 6 cases were malignant pheoehromoeytorna. Pheoehromoeytorna presented as a relatively big round or irregular mass （mean diameter 5.7cm）. The signal intensity on T1WI was similar to that of hepatic parenchyma, while on T2WI was marked hyper-intensity. Most of them showed strong enhancement in parenchyma （40/59）. Necrosis and cystic degeneration were common findings （36/ 59）. Conclusion MRI scanning can display the tumor＇s location, shape, size, component, blood supply and the relation with surrounding structures well, and is valuable for the diagnosis and differentiation of pheoehromoeytoma.