Oncology · Gynecologic Oncology
The facts most likely to be tested
Epithelial ovarian cancer is the most common histologic subtype and typically presents with vague abdominal symptoms, bloating, and early satiety.
BRCA1 and BRCA2 mutations are the most significant genetic risk factors, necessitating prophylactic salpingo-oophorectomy after childbearing is complete.
CA-125 is the primary tumor marker used to monitor treatment response and disease recurrence, though it lacks sufficient sensitivity for population-based screening.
Transvaginal ultrasound is the initial imaging modality of choice for a suspected adnexal mass, looking for solid components, thick septations, and ascites.
Ovarian cancer spreads primarily via direct peritoneal seeding, often resulting in omental caking and malignant pleural effusions.
Nulliparity, early menarche, and late menopause increase the lifetime number of ovulatory cycles, thereby increasing the risk of epithelial ovarian malignancy.
Combined oral contraceptive pills are protective against ovarian cancer by suppressing ovulation and reducing the cumulative trauma to the ovarian epithelium.
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A 62-year-old postmenopausal woman presents to the clinic with a 3-month history of increasing abdominal girth, persistent bloating, and urinary frequency. Physical examination reveals a palpable pelvic mass and shifting dullness on abdominal percussion. A transvaginal ultrasound demonstrates a 10 cm complex adnexal mass with solid components and thick septations. Her serum CA-125 level is significantly elevated.
What is the most appropriate next step in the management of this patient?
Exploratory laparotomy with surgical staging and debulking
The patient presents with classic signs of advanced epithelial ovarian cancer; surgical exploration is required for definitive diagnosis, staging, and cytoreduction (debulking) to remove as much tumor as possible.
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Etiology / Epidemiology
Highest mortality of GYN cancers; BRCA1/2 mutations and nulliparity are primary risk factors.
Clinical Manifestations
Often asymptomatic until late; presents with abdominal distension, early satiety, and ascites.
Diagnosis
Transvaginal ultrasound is the initial imaging; CA-125 is the primary tumor marker for monitoring.
Treatment
Cytoreductive surgery (debulking) followed by Paclitaxel + Carboplatin chemotherapy.
Prognosis
Poor survival due to late detection; 75% present with stage III/IV disease.
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Epidemiology & Etiology
Most common in postmenopausal women, with a median age of 63. BRCA1/2 mutations significantly increase lifetime risk. Protective factors include combined oral contraceptives, multiparity, and breastfeeding, which reduce the number of lifetime ovulatory cycles.
Pertinent Anatomy
Ovaries are intraperitoneal organs, allowing early malignant cells to seed the peritoneal cavity. This explains the rapid development of omental caking and malignant ascites.
Pathophysiology
Most are epithelial in origin, arising from the ovarian surface epithelium or fallopian tube fimbriae. Chronic inflammation from repetitive ovulation causes DNA damage, leading to p53 mutations in high-grade serous carcinomas.
Clinical Manifestations
Patients present with vague, persistent GI symptoms: bloating, pelvic pain, and urinary urgency. Physical exam may reveal a fixed, solid pelvic mass or Sister Mary Joseph nodule (umbilical metastasis). Red flags include rapid weight loss and bowel obstruction.
Diagnosis
Transvaginal ultrasound is the diagnostic modality of choice to characterize adnexal masses. CA-125 levels are elevated in 80% of epithelial cancers but lack specificity in premenopausal women. Exploratory laparotomy is the gold standard for definitive staging and tissue diagnosis.
Treatment
Primary management is cytoreductive surgery to remove all visible tumor. Adjuvant chemotherapy with Paclitaxel + Carboplatin is standard for advanced stages. Avoid ovarian biopsy prior to surgery to prevent tumor seeding.
Prognosis
Prognosis is strictly stage-dependent, with 5-year survival dropping to <30% for stage IV. Recurrence is common, requiring serial CA-125 monitoring and imaging.
Differential Diagnosis
Uterine fibroids: firm, irregular uterus on bimanual exam
Functional ovarian cyst: usually resolves within 2 menstrual cycles
Endometriosis: associated with dysmenorrhea and dyspareunia
Pelvic inflammatory disease: fever, cervical motion tenderness
Ectopic pregnancy: positive beta-hCG, acute abdominal pain