Preoperative cardiopulmonary complications are positive correlated to preoperative complications (P0.01).

术前伴心肺合并症者与围术期并发症呈正相关性（P 0 0 1）。

Preoperative preparation should be well made;

做好充分的术前准备；

Preoperative sonogram and CT scan were performed.

手术前进行超音波,电脑断层摄影的评估.

Preoperative and postoperative visual acuity was compared.

结果术后26眼(92.86%)视力较术前提高.

Method: Preoperative diagnosis was made by CT or MRI scan.

方法: 本组均经计算机体层摄影(CT)或磁共振成像(MRI) 扫描确诊.

Preoperative and postoperative brain CT scans were performed.

两组均行术前术后颅脑计算机体层摄影(CT).

All other preoperative parameters were similar in both groups.

两组间其他所有的术前参数是相似的。

None of patients received preoperative anticancer treatment.

所有患者术前均未接受抗癌治疗。

Preoperative visual acuity(VA)with postoperative VA were compared.

对术前和术后视力进行比较。

Objective To evaluate the preoperative CT scan of rectal carcinoma.

目的评估直肠癌术前CT扫描的价值。