Below is an instruction that describes a task. Write a response that appropriately completes the request. ### Instruction: Can CT Scan without Contrast IV detect Pelvic/Abdominal Cancer22m, 220lbs, 5'6. No smoking or alcohol use.Got a CT scan from ER to look for kidney stones and they found none.Quote the patients case was ultimately discussed with urology who agreed with further evaluation with CT abdomen and pelvis to rule out renal and urethral calcinotic/renal pathology. The patient demonstrated no signs of acute intra-abdominal renal pathology. Urology advised to follow up with non-urgent cytoscopy"Im currently experiencing a lot of dull abdominal pain and worried about potentially having cancer in the pelvic region.For 3 months Ive had lower abdominal pain, frequency urinating, pain when urinating, urethral pain.I have no signs of kidney stones, leukocytes or blood in urine. Ive tested negative for bacterial STDs as well and even Hep B and C, Syphilis, HIV at 3 months.. ### Response: To answer your question, a non-contrast CT scan does not rule out cancer in the abdomen/pelvis, barring a huge mass or obvious metastases. In fact, even a contrast enhanced CT scan is not very sensitive for several types of cancer.You should discuss with your physician whether or not additional imaging would be warranted. I don't know much about your history but in general, it is exceedingly rare for a 22 year old to suddenly develop some sort of intra-abdominal malignancy..