#12: 35 Year-Old Man with Back, Flank, and Abdominal Pain

<p>A 35 year-old man presents with back, flank, and abdominal pain. What is the most likely diagnosis? What is the next best step?<br> <br> For a free 100+ page excerpt of our best-selling residency match book, please visit us at&nbsp;<a href="http://www.thesuccessfulmatch.com/" rel="noreferrer" target="_blank">www.TheSuccessfulMatch.com</a>.</p>