MSRA-2122

A 72-year-old male presents to the surgical assessment unit with lower abdominal pain and inability to pass urine for the past 12 hours. He has a palpable bladder and tenderness in the suprapubic region. On PR examination, his prostate is smooth and not enlarged. He has a medical history of high blood pressure, depression, neuropathic pain, and diabetes. What could be the probable cause of his presentation?