通过典型的部位、相对固定的大小和典型的影像特征应该可以获得确诊，从而避免不必要的侵入性的操作，如活检或外科手术。
Its typical location, stable lesion size and classic imaging features should allow accurate diagnosis and prevention of unnecessary invasive procedures, such as biopsy and surgical intervention.
排除男方不育因素可以避免不必要和昂贵的手术花费同时规避其伴随的风险。
Ruling out a significant male factor avoids unnecessary and costly surgery with its attendant risks.
手术治疗仍然是胰腺癌唯一可治愈的方法，因此术前准确分期相当重要，以避免不必要的手术探查。
Surgery remains the only option for cure. Accurate diagnosis and staging of pancreatic cancer are therefore of great importance, and unnecessary laparotomy exploration will he avoided.
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