An extrauterine pregnancy will be visualized in only 16 to 32 percent of cases, thus a pelvic ultrasound showing "no intrauterine or extrauterine gestation" does not exclude the diagnosis of EP.
只有16 - 32%的病例等发现宫外孕包块，这是即使盆腔超声显示宫内及宫外均未见妊娠，并不能除外宫外孕的诊断。
An extrauterine pregnancy will be visualized in only 16 to 32 percent of cases, thus a pelvic ultrasound showing "no intrauterine or extrauterine gestation" does not exclude the diagnosis of EP.
只有16 - 32%的病例等发现宫外孕包块，这是即使盆腔超声显示宫内及宫外均未见妊娠，并不能除外宫外孕的诊断。
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