Ultrasound for the study of retroperitoneal lesions.
D006801:Humans; D010181:Pancreatic Cyst / Q000175:diagnosis; D010190:Pancreatic Neoplasms / Q000175:diagnosis; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis; D012187:Retroperitoneal Space; D014463:Ultrasonography