A 52-year-old man presents with right-sided flank pain for three hours. The pain was sudden in onset, has been constant, and is described as 10/10 in intensity, with a decrease to 8/10 after the administration of NSAIDs and morphine. He also experienced two episodes of vomiting.
There is no history of chest pain, dyspnea, fever, or bowel/bladder dysfunction. His medical and surgical histories are unremarkable.
An ECG, complete blood count, and urinalysis are performed. The former two investigations show no abnormalities, while the latter is only positive for microscopic hematuria, with no pus cells, and negative nitrite and leukocyte esterase dipstick tests.