abnormal extraembryonic tissue morphology abnormal proamniotic cavity morphology 2011-06-23T01:54:24Z MP:0011197 MPheno.ontology abnormal epiblast cavity morphology abnormal preamniotic cavity morphology abnormal pro-amniotic cavity morphology any structural anomaly of the cavity of the developing embryo that is formed within the epiblast tissue prior to the closing of the proamniotic canal by the amniotic folds csmith