Case Presentation: The patient is a 16-year-old primigravid woman with past medical history of recurrent childhood UTIs and prior treatment for right pyelonephritis with hydronephrosis at 28 weeks’ gestation. At that time she had a right percutaneous nephrostomy tube placed with subsequent resolution of the right hydronephrosis.  Her urine culture grew Stenotrophomonas maltophilia and she [...]