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A 31-year-old motorcyclist is involved in a motor vehicle collision in which he suffered a direct blow to his lower abdomen and pelvis. He reports diffuse abdominal pain and a dull pain in the left shoulder. The patient has no prior medical problems and has been healthy. Blood pressure is 110/80 mm Hg, pulse is 92/min, and respirations are 16/min. No deformity of the left shoulder is noted, and complete range of motion is preserved. Cardiopulmonary examination shows no abnormalities. Diffuse abdominal tenderness with guarding is present. No other injuries are seen. Which one of the following injuries is most likely to be seen on CT scan of the abdomen in this patient