Endometrial (lining of uterus
) thickness of 3 cm is not normal. It could be due to
1.Missed or incomplete abortion
2. Endometrial polyp
( Polyp is abnormal thickening of endometrium which should be removed)
Thick walled irregular right ovarian cystic lesion could be a corpus luteal cyst
( cyct formed after ovulation) which is normal.
If information about your age, date of your last period and regularity of periods was available it would be useful to me.
Do a pregnancy
test and consult your doctor.
If you have any further queries I would be happy to answer