Results:1) There is no embryonic tissue in gestation sac without or with little villous tissue in anembryonic pregnancy.
结果：1）枯萎卵妊娠的胎囊内只有囊液，没有胚胎组织。 妊娠囊外没有绒毛组织或绒毛组织较稀疏。
Results The detection rate of mass, yolk sac, embryonic bud, embryonic heartbeat and ovary was higher in the TVS or TAS TVS test than those in the TAS test (P<0.01).
结果TVS及TAS TVS对附件区包块、卵黄囊、胎芽、胎心搏动、宫内假孕囊、卵巢的检出率远较TAS高，差异均有统计学意义（P<0.01）。
Results The detection rate of mass, yolk sac, embryonic bud, embryonic heartbeat and ovary was higher in the TVS or TAS TVS test than those in the TAS test (P<0.01).
结果TVS及TAS TVS对附件区包块、卵黄囊、胎芽、胎心搏动、宫内假孕囊、卵巢的检出率远较TAS高，差异均有统计学意义（P<0.01）。
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