This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical Illness Complicating Pregnancy, Subject name: Gynaecology & Obstetrics
[{'content': 'A patient at 5 months pregnancy complains of acute lower abdomen pain. On examination cervical os is closed and there is a tender right adnexal mass. On USG there is a normal intrauterine pregnancy with a 6 cm right ovarian dermoid cyst. Most probable diagnosis is? \nSelect and explain. \nA. Inevitable aboion, B. Ovarian torsion, C. Hemorrhage in cyst, D. Red degeneration', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ovarian masses in pregnancy may be symptomatic or incidentally detected on USG. Here since the ovarian mass is extremely tender, it has probably undergone torsion and a Doppler should be done to diagnose torsion followed by an urgent cystectomy Complications of ovarian masses in pregnancy Rupture Torsion Hemorrhage Obstruction in labour Management <5 cm: follow up 5-10 cm: cystectomy in case of torsion, rupture, suspicion of malignancy, sudden increase in size during follow up >10 cm: elective cystectomy in second trimester NOTE: red degeneration is a complication of fibroid in pregnancy Since cervical os is closed, it is not a case of inevitable aboion', 'role': 'assistant'}]