注入したオリーブ油による膀胱結石

BLADDER STONES CAUSED BY OLIVE OIL USED AS BLADDER CONTRAST MEDIUM ON PELVIC CT-SCAN

　子宮頸癌根治術後の経過観察中に行った骨盤部CT検査時に，注入したオリーブ油が原因と考えられる脂肪酸カルシウム膀胱結石の1例を経験した．自験例はCT検査後約6ヵ月にわたり排尿時にオリーブ油の排泄がみられたことより，検査後膀胱内に残留したオリーブ油の成分とカルシウムが反応し，さらに感染などの要因が加わり結石が発生したものと考えられた．膀胱造影剤としてオリーブ油を用いる場合，排尿障害を有する患者には注意を要する．

A case of fatty acid bladder stones was reported. A 61-year-old Korean woman who had been followed -up after radical hysterectomy for uterine cervical cancer underwent pelvic CT-scan with intravesical instillation of olive oil as a contrast medium. She was referred to our clinic for recurrent cystitis and diagnosed as bladder stones. The stones were consisted of calcium phosphate and stearin calcium which was one of constituents of olive oil. Close anamnesis revealed that she had excreted oil in urine on every micturition for 6 months after CT-scan.