A 22 year old man presents with abdominal pain and diarrhoea. He has 3 months of intermittent diarrhoea sometimes with blood, accompanied with weight loss and abdominal discomfort.
60 y/o man with 3 days suprapubic pain; 'pelvic ache' on urination; suprapubic tenderness and guarding on examination; and leukocytes in the urine. You are considering just treating as a urinary tract infection but the degree of tenderness makes you take a look with ultrasound.