上段の単純CTで，図４のA〜図１のDは回腸末端で，図３〜図７の↑は図４の▲を根部とする虫垂病変である．症例RR６９の参考症例に類似し，粘液嚢腫（mucocele）である．下段の造影CTで極めて重要な所見がある．図１１〜図１３で淡い造影効果を受ける乳頭状結節（△）は腫瘍性嚢胞を意味し，悪性腫瘍の可能性がある．病理：mucinous cystadenocarcinoma．

文献考察：mucinous cystadenocarcinomaのCT所見：老齢者で，mucocele壁の，造影される乳頭状結節は悪性を示唆する所見である．
AJR Am J Roentgenol. 1999 Oct;173(4):1071-4.
Primary mucinous cystadenocarcinoma of the appendix: CT findings.
Lim HK, Lee WJ, Kim SH, Kim B, Cho JM, Byun JY.
OBJECTIVE: The preoperative diagnosis of a primary appendiceal tumor can be difficult because of its rarity and the paucity of material in the radiology literature. The purpose of this study was to describe CT findings in six patients with primary mucinous cystadenocarcinoma of the appendix. CONCLUSION: When CT reveals a cystic mass with enhancing wall nodularity in the expected area of the appendix, especially in older patients, the possibility of primary mucinous cystadenocarcinoma should be considered.PMID: 10511181