What else is there?
Rather than a morose outlook on life itself, this nugget was a great little for when you think you have worked out what the problem is.
What other problems or lesions are there?
Congenital anomalies especially often travel in pairs or groups. Trauma patients may have multiple fractures that aren’t immediately obvious because they’re on so much ketamine. Chest X rays very often have multiple lesions, and it is tempting to stop searching when you think you’ve found one lesion (satisfaction of search is an entire area of research into radiological error!) A fractured rib often has a pneumothorax in its wake!
Don’t assume anything, ever, but especially don’t assume that the problem you have found is the only problem.