###Human: My periods have been slightly irregular. What may be the reason? ###Assistant: Hello. The ultrasound scan report (attachment removed to protect patient identity), which you have posted shows a single follicle dominant, may be in the right ovary. Also, please mention your details of menstrual cycles and dates for last three months to understand the pattern of bleeding. Revert back with the reports and detailed information to an obstetrician and gynaecologist online -->