Retrospective analysis of preoperative localization of insulinomas on CT / 中南大学学报(医学版)

ABSTRACT

OBJECTIVE@#To compare the value of CT using different equipment and scanning methods in preoperative localization of insulinoma and to investigate the possible causes that might influence the detection ratio on CT.@*METHODS@#A total of 47 patients with insulinomas confirmed by operation and pathologic examination from 1990 were collected, and the related clinical information and imaging data of CT were retrospectively analyzed.@*RESULTS@#The diagnostic accuracy for conventional CT with conventional enhancement scanning, spiral CT with pancreatic phase scanning, and multislice spiral CT with dual phasic enhancement scanning were 35.3%, 57.1%, and 81.3%, respectively, and the overall diagnostic accuracy of CT was 57.4%. The diagnostic accuracy of multislice spiral CT was greater than that of conventional CT (P or =1.5 cm was significantly higher than that of <1.5 cm (76.2%vs. 42.3%). Typical appearance of the lesions on CT was isoattenuation on plain scanning, and enhanced considerably after contrast enhancement.@*CONCLUSION@#The size of lesion is the major factor that influences the detection of insulinoma on CT. Multislice spiral CT with dual phasic enhancement scanning has a relatively high detection rate and is recommended for preoperative localization of insulinoma.