A helicopter is dispatched to a remote location where a 35-year-old male has sustained blunt abdominal trauma in a motor vehicle collision. Upon arrival, you note the patient is hypotensive, tachycardic, and has abdominal distension with bruising on the flank (Grey Turner's sign). What is the most likely diagnosis?
Diaphragmatic rupture
Hollow organ injury
Retroperitoneal hemorrhage
Splenic rupture