X-rays are tricky....(true story!)

Recently, in our Problem Based Learning (PBL) class we were practicing how to make a diagnosis on a case-study patient. We reviewed some x-rays of the patient in question. The patient is suspected of having liver swelling and thus we were hoping to see on her X-rays an enlarged peritoneal cavity (abdominal area) and a decrease in size of her thoraxic cavity (chest area) due to the organs in the peritoneal cavity pushing up against the diaphram.

Anyway, one of my friend, upon viewing two x-rays, proclaimed loudly to the class: "This profile image of her abdominal and thoraxic regions clearly shows that her liver is greatly distended. Just look at that, it's practically outside of her body!"

The rest of us, meanwhile, looked at each other confusingly and said, " Eric, what do you mean? Where do you see the liver outside of her body?"

Eric replied, pointing to a large globular mass on the x-ray: "see here, this is her peritoneal cavity, and isn't that her liver all distended?"

After several seconds of awkward silence, finally, someone replied:" Um dude...that's her breast."

True story!!!