Typical appearances and site for Paget disease of the bone with the pelvic brim sign. It is frequently an incidental finding. 

With all radiographs:

• assess the whole film, even the bits not related to the clinical query
• satisfaction of search is called so for a reason
• you never know when your report might help; for example, in this case, five years later when a bone scan is undertaken for prostate carcinoma and a hot right hemipelvis is observed. This AXR provides proof that it is not a metastasis
• this could be a rapid reporting film in FRCR, a good way of checking a candidate's diligence