Objective To discuss the aberrant right subclavian artery in CT,X-ray imaging manifestations and clinical meanings. Methods Analyzed 34 aberrant right subclavian artery cases' imaging features retrospectively and explicitly understand the clinical datas.At the same time,analyzed clinical meanings based on the documents. Results 8 cases in X-ray barium meal examination,6 cases showed that esophagus at aortic arch margo superior in back-front and oblique directions,runs a lower left to upper right spiral impressions,which was smooth,and the esophagus was locally cramped.CT in all 34 cases,in a single lay,aberrant subclavian artery was manifested as a soft-tissue nodule alongside or behind the esophagus,or a linear leaf,both connected to the aortic arch,and the density of them was equal to the vessels'.Continuous lays and rebuilded images show that aberrant right subclavian artery originates from the distal in-wall of aortic arch,and turns around the esophagus toward the upper right.It could impress the esophagus,but most of the patients had no symptoms.in a few esophagus and trachea seriously impressed cases,particularly in the aged,ocured the dysphagia and shortness of breath. Conclusion Aberrant right subclavian artery is easily found out in CT examina-toin,and observed the impression to the esophagus and trachea.in some cases,it also ocures in barium meal,but af-firmed by CT. To correctly understand the aberrant right subclavian artery 's imaging manifestions have a significant meanings in clinic.

OBJECTIVETo estimate the diagnostic accuracy of magnetic resonance(MR) in restaging of rectal cancer after preoperative chemoradiotherapy(CRT).

METHODSComprehensive search of literature concerning the diagnosis of MR for rectal cancer after preoperative CRT was performed from databases of PubMed, EMbase, OVID and WOK. Sensitivity and specificity of MR on restaging of rectal cancer after preoperative CRT were investigated by SAS and MetaDiSc software.

RESULTSThirteen articles including 749 patients were enrolled in this meta-analysis. For T3-T4 stage, sensitivity of MR was 82.1%(95%CI:67.9%-90.9%), specificity was 53.5%(95%CI:39.3%-67.3%), and diagnostic odds ratio(DOR) was 5.34(2.73, 6.59). For lymph node involvement, sensitivity of MR was 61.8%(95%CI:50.7%-71.8%), specificity was 72.0%(95%CI:61.3%-80.7%), and DOR was 4.33(95%CI:2.84-6.59). For circumferential resection margin(CRM) by MR, pooled sensitivity was 85.4%(95%CI:60.5%-95.7%), specificity was 80.0%(95%CI:57.4%-92.3%), and DOR was 27.62(95%CI:13.03-58.55).

CONCLUSIONSRestaging accuracy of T3-T4 and lymph nodes involvement of rectal cancer after preoperative CRT by MR is not high. MR may be a good method to make reassessment of CRM. To avoid overtreatment for T0-T2, negative lymph node and circumferential resection of rectal cancer, restaging by MR after preoperative CRT is important.

Chemoradiotherapy ; Humans ; Magnetic Resonance Imaging ; Magnetic Resonance Spectroscopy ; Neoplasm Staging ; Rectal Neoplasms ; pathology ; therapy