Ovarian hyperstimulation syndrome is a recognized complication of fertility therapy such as in-vitro fertilisation. The ultrasound and MRI studies show bilaterally enlarged ovaries with multiple follicles, and a small volume of free blood in the pelvic indicating rupture of one or more of the follicles. There were no signs of other acute inflammatory processes such as acute appendicitis. The pregnancy progressed to term with no further interventions required.