Abstract: Objective To discuss the pathognomonic performance of appendiceal mucinous cystadenoma detected by multidetector CT( MDCT ). Methods Retrospective analysis was made on MDCT image of eight patients with appendiceal mucinous cystadenoma. Results The appendiceal mucinous cystadenoma in the eight patients was in the right lower quadrant within the caecum,and the near-end of lesion was linked with caecum while the far-end was invisible. Appendiceal lumen was widened in different sizes. Diameter of each lesion in 8 patients was over 2. 5cm. Seven of the lesions showed oval or elongated monolocular change and 1 lesion showed delicate separation. Eight capsule walls were smooth both inside and outside,either thin or thick. Four inner walls had strip-type or eggshell-type calcification. CT value of inner tissues was about 13 to 21Hu,2 discontinuous appendiceal lining were coupled with pseudo-mucotumor in pelvic cavity. No inflammation was detected around 6 lesions,which were not wrapped by omentum and no swelling lymphonodus were detected in mesentery. Cyst walls after contrast enhancement and septums were seen strong enhancement while inner capsule tissues were not seen enhancement. Conclusion Through multiplanar reformation,MDCT could be make a direct and correct diagnosis of appendiceal mucinous cystadenoma.

Key words: appendiceal neoplasms, tomography, spiral computed, diagnosis