A 32-year-old woman presents to her general practitioner with a 6-month history of worsening dysmenorrhea and pelvic pain, particularly on the left side. She reports no fever, weight loss, or abnormal vaginal bleeding. Her last menstrual period was 2 weeks ago and was normal. Physical examination reveals mild left adnexal tenderness. A CT scan of the pelvis was performed, the relevant image is shown. Given the clinical context and the imaging findings, what is the MOST appropriate next step in management?