Review Question - QID 210571

A 4-month-old boy is brought to his pediatrician by his mother for a wellness exam. The mother reports that the infant has generally been well, but she has noticed a scrotal mass when she bathes him. However, the mass does not appear at night when the infant is asleep. She says that the mass does not appear to be painful to palpation. She denies any history of vomiting, colicky abdominal pain, or constipation in the patient. The boy was born at 37 weeks to a healthy 28-year-old woman via a spontaneous vaginal delivery with no complications. His temperature is 99°F (37.2°), blood pressure is 80/65 mmHg, pulse is 150/min, and respirations are 16/min. On physical exam, there is a right-sided scrotal bulge. He has the following finding in Figure A. Which of the following is the most appropriate next step in management?