Radiopaedia.org

In the left upper lumbar triangle there is a protrusion of retroperitoneal fat with incarceration of the ipsilateral kidney. Thinned latissimus dorsi muscle and disrupted thoracolumbar fascia. There is a modest pleural effusion on the right.  At the bladder base, on the right, there's a papillary lesion with enhancement, near the ureteral orifice.