Could someone please tell me what does subseptate variety of uterus mean?

Hullo my friend asked me to ask this question for her she went to the Drs because she was having the injection depo provera for 3 years and 15 months ago the dr told her to stop taking it and 3 weeks ago she had some light bleeding so she went to the drs and he told her to have a ultrasound and this is what it said There appears to be subseptate variety of uterus in the transverse scan. endometrial cavity echo is thin measurinf 2mm in thickness. No discrete uterine m lesion is shown. No gross submucosal abnormality is demonstrated. The right ovary appeared normal measuring 1.8cc in volume. left ovary was difficult to identify. What i take to be the left ovary is o.3cc in volume. There is no adnexal m or free fluid. in the pouch of douglas. could someone please tell me what this means as i do not know? my friend is worried as the dr told her to see a gynacologist because of this does anyone know if this is somethink to worry about ? thankyou