文献考察:虫垂結石・糞石(appendiceal fecalith,appendicolith)はCTで42%に認められる.
1)Choi YH, Fischer E, Hoda SA, Rubenstein WA, Morrissey KP, Hertford D, Hwang K, Ramirez de Arellano E, Kazam E. Appendiceal CT in 140 cases. Diagnostic criteria for acute and necrotizing appendicitis. Clin Imaging. 1998 Jul-Aug;22(4):252-71.
Computed tomography (CT) was performed in 140 patients with suspected acute appendicitis. Thin collimation (5 mm), intravenous contrast enhancement, 1-second scan times, and supplementary cecal air insufflation were emphasized. CT accuracy was 98% overall (137/140), and 99% in the 124 cases with early surgery. Necrotizing appendicitis was diagnosed by CT with 86% accuracy and 90% positive predictive value. PMID: 9699047
2)山本哲久, 望月英隆. 消化管症候群 虫垂 虫垂結石 日本臨床 別冊 領域別症候群6 Page705-707(1994.12)
要旨:結石calculiとは,指圧で容易に壊れず,腹部単純写真上鮮明な映像を与える程度の無機物を主体とするもので,糞石は糞塊よりは硬いが指圧によりつぶすことができ,有機物が主体であるものをさす.虫垂炎の術前に腹部単純写真で結石が認められる頻度は5〜10%程度で,虫垂の炎症を伴わない場合は低く,1〜2%程度である.結石の数は1個のものが多く,大きさは1cm前後が普通で2cm以上のものはまれである.結石を有する虫垂炎は重症化しやすい.
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