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Acute Pelvic Pain: AnswersDifferential diagnosis:%u2022 Ectopic pregnancy%u2022 Ovarian torsion%u2022 Ruptured ovarian cyst%u2022 Acute appendicitis%u2022 Pelvic inflammatory diseaseKey physical examination findings:%u2022 Abdominal tenderness and guarding%u2022 Cervical motion tenderness%u2022 Adnexal tenderness or mass%u2022 Signs of peritonitisInvestigations:%u2022 Pregnancy test (urine and serum %u03b2hCG)%u2022 Transvaginal ultrasound%u2022 Complete blood count%u2022 C-reactive proteinExplanation:%u2022 The sudden onset of severe pain and history of missed period raise suspicion for ectopic pregnancy, which is a medical emergency.