Enlarged uterus.
The endometrial cavity is occupied by a gestational sac with lobulated edges, with dimensions of 47 x 28 x 33 mm for a gestational age of 8.6 weeks per mean diameter of the sac. Embryonic pole with a cranio-caudal length of 13 mm for a gestational age of 7.4 weeks, without identifying cardiac activity.
Adjacent to the embryonic pole, an anechoic ovoid image with well-defined, hyperechoic borders corresponding to the yolk sac with an approximate dimension in its longitudinal axis of 15 mm.