question: Q:A 48-year-old woman presents with a 15-year history of long, painful menses that is only partially relieved with oral contraceptives. She desires definitive treatment. She denies weight loss or post-coital bleeding, and her husband has been her only sexual partner. She does not have a history of smoking, alcohol or illicit drug use, or sexually transmitted diseases. She sees her gynecologist annually. She takes no medications. An abdominal ultrasound shows a non-gravid uterus with hyperechoic islands and an irregular endometrial-myometrial junction, consistent with adenomyosis. A supracervical hysterectomy and left salpingo-oophorectomy are performed without incident. Later that day, the patient’s vitals are stable: temperature 36.8°C (98.2°F), heart rate 98/min, respiratory rate 15/min, blood pressure 100/75 mm Hg, breathing 100% oxygen on room air. The patient is not in acute distress with a Foley catheter in place. The physical exam is unremarkable. However, she has only excreted a minimal amount of urine output in the past several hours after surgery. Only 10cc or urine is produced over the next 12 hours. A bladder scan shows minimal residual urine. CBC, CMP, and urinalysis are ordered, and renal ultrasound is shown in the picture. What are the likely cause of this patient’s anuria and ultrasound finding?? 
  {'A': 'Heart failure secondary to overly aggressive fluid resuscitation', 'B': 'Iatrogenic injury near the suspensory ligaments', 'C': 'Prerenal azotemia secondary to excessive hemorrhage', 'D': 'Acute tubular necrosis secondary to hypovolemia', 'E': 'Cervical cancer'},