図１〜図６の10mmスライスCTで，盲腸（C）は図２で盲端になり，TIが回腸末端と思われる．図１の１が虫垂根部で，図２の２で糞石の嵌頓を認め，そこから腫大し始め図５で盲端になる．約1cm大に腫大し，図２〜図４で軽度だが周囲脂肪組織の濃度上昇を認め（△）急性虫垂炎と診断できるが，周囲脂肪組織が少なく10mmスライスだとやや困難である．

図７からの5mmスライスCTでは，図８の１〜図１６の９が虫垂であることの認識が容易になり，腹膜の肥厚（図１２〜図１５：▲）と周囲脂肪組織の濃度上昇（図１０〜図１４：△）もより明瞭となる．病理：phlegmonous appendicitis（図A）．

文献考察：10mm；5mmスライスCTでsensitivity 82→99%，specificity 95→98%，accuracy 69→94%とかなり診断の精度が向上した．虫垂炎以外の症例で正常虫垂は10mmスライスで52％に，5mmスライスで75％に認識できた．
Radiology. 2000 Jul;216(1):172-7.
Diagnosis of acute appendicitis: comparison of 5- and 10-mm CT sections in the same patient.
Weltman DI, Yu J, Krumenacker J Jr, Huang S, Moh P.

PURPOSE: To compare 5- and 10-mm computed tomographic (CT) sections in the same patient to diagnose acute appendicitis. MATERIALS AND METHODS: During an 11-month period, 100 consecutive patients clinically suspected to have acute appendicitis underwent abdominal and pelvic CT. Helical, 10-mm-collimated sections from the diaphragm to the pubic symphysis and 5-mm-collimated sections through the lower part of the abdomen and upper part of the pelvis were obtained. The 10- and 5-mm sections from each patient were separated into two groups and were interpreted independently by two abdominal imaging attending physicians who were blinded to the final results. The interpretations were correlated with the histopathologic or final clinical diagnoses. RESULTS: Data analysis from blinded reader interpretations of the 5- and 10-mm sections, respectively, revealed sensitivities of 99% and 82% (P <.001 specificities of and accuracies among the cases acute appendicitis abnormal appendices were identified in on sections respectively. right-lower-quadrant inflammatory changes normal negative conclusion: use thin-section ct significantly improves diagnosis appendicitis.pmid:>