If gas distended colon was found by KUB, colon injury could be avoided by evaluating its position to the kidney before percutaneous nephrostomy and/or nephrolithotomy.

• 希望日后从事经皮肾造瘘术及经皮肾取石术之前，若腹部素片发现邻近肾脏有涨气之结肠，能先评估结肠与肾脏之相关位置，以避免在操作中误伤结肠。