Clive, a 52-year-old store clerk, has had fever and right-sided abdominal pain since waking up today. He had a similar episode of pain without fever 11 months ago; at that time, he was found to have a 2 mm x 3 mm x 5 mm stone lodged in the right ureterovesical junction (UVJ). He was treated with medical expulsive therapy. After passage, the stone was found to be formed from magnesium ammonium phosphate. His comorbidities include type 2 diabetes mellitus, hypertension, and dyslipidemia, all for five years. These are well-controlled on metformin, telmisartan, and rosuvastatin. He is not on any other medications. His family history is unremarkable. There is no history of allergies to drugs or foods. He does not smoke and only drinks socially.