Absolutely do the cystoscopy and biopsy. CIS (carcinoma in situ) is flat and not likely to show up on a CT scan. Cytology is almost always negative for lower grade tumors. You have risk factors for bladder cancer (male, smoker); the aspirin may have made bleeding worse, but I suspect that may not have been the root cause (but I'm no medical expert). Under the circumstances, it would be very wise to proceed with the scheduled cystoscopy and biopsy
I'm not in a high risk group for bladder cancer (female, non-smoker, no chemical exposure). However, after one bout of gross hematuria, my doctor got me right in for tests (CT, cytology--negative) and to a urologist for cystoscopy. Had a single papillary (low grade) tumor removed. That was 2 years ago, and I had no recurrence during that time, but recently had two tiny new tumors (same type) removed, and have just completed 6 weeks of BCG treatment to slow up future recurrences or progression. Bladder cancer may be one of the more easily controllable types of cancer, but you have to be vigilant in getting checked and in being treated for any recurrence.
Ann
Small TA Grade 1, May-06; recur (2 tiny), same, June-08; TURBTs both times. BCG begun July-08, dosage to 1/3rd May-10, completed treatment December-11. All clear since 2008.