腔内水囊磁共振成像对直肠癌术前分期的诊断

目的评估腔内水囊磁共振成像（MRI）预测直肠癌术前分期的准确程度。方法回顾性分析19例直肠癌患者的临床资料，对照术前MRI和术后病理结果．评估MRI能否准确预测直肠癌T和系膜淋巴结转移（N）分期。结果MRI正确T分期15例（78．9％），错误4例，其中2例T1-2期报告为T3期，2例T3期报告为T1-2期；T1-2期的准确率为80％（8／10），B期的准确率为7／9。MRI正确N分期11例（57．9％），错误分期8例；其中高估2例，低估6例，灵敏度为3／9，特异度为80．0％（8／10）。结论术前腔内水囊MRI不能对直肠癌系膜淋巴结转移做出准确预测，可以对T分期进行一般预测。

Diagnosis on the preoperative staging of rectal cancer by magnetic resonance imaging with water-bag in rectum]

OBJECTIVE: To evaluate the accuracy of preoperative magnetic resonance imaging (MRI) with water-bag in rectum in prediction of pathological staging of rectal cancer. METHODS: Clinical data of 19 patients with rectal carcinoma assessed by MRI with water-bag in rectum for tumour (T) and mesorectal nodal (N) staging were analyzed retrospectively. Preoperative MRI assessment was compared with postoperative histopathological findings. RESULTS: The tumors were correctly staged by MRI in 15 patients, understaged in 2 and overstaged in 2. The accuracy of T stage was 78.9% (15/19). Mesorectal node were correctly staged in 11 patients, overstaged in 2 and understaged in 6. The accuracy of node staging was 57.9% (11/19), sensitivity was 3/9, and specificity was 80%(8/10). CONCLUSION: Preoperative MRI with water-bag in rectum can not provide correct predictive data on mesorectal node stage, but has certain value in the T staging of rectal carcinoma.