Transitional cell carcinoma (TCC) in dogs
From Chapter 11 – Bladder and Urethra 
Figure 11.16. Transitional cell carcinoma (TCC) in dogs. A: Longitudinal sonogram of an extensive TCC affecting the ventral and dorsal bladder wall, in a 10 year old Lhapsa Apso. B: In the same dog as A. the TCC extends caudally into the bladder neck and urethra (U). C: A cauliflower shaped nodule arising from the craniodorsal wall was found incidentally in a dog presented for urinary obstruction secondary to a urethral calculus. It was confirmed as papillary non infiltrating TCC after surgical removal. D: Longitudinal sonogram of a broad-based hyperechoic mass associated with the craniodorsal bladder wall, consistent with transitional cell carcinoma. E: Longitudinal sonogram in another dog without urinary clinical signs in which focal irregular thickening of the dorsal bladder wall was detected incidentally. Color Doppler signal (arrow) confirmed that this lesion was attached to the bladder wall, as opposed to a blood clot. F: Two separate transitional cell carcinoma masses (M1 and M2) in another dog with mineralization causing acoustic shadowing (*). The arrowheads delineate the apical bladder wall.
co-authored by James Sutherland-Smith and Dominique Penninck
If I would find such a small lesion like on image E how fast do I need to recheck it to start investigating TCC?
Thank you.
Regatds
TCC grow at different rates, but I would suggest a recheck in 4-6 weeks followed by an endoscopic or excisional biopsy if static or progressive. Its location makes it easy to remove at this size. Better not take the chance to wait too long on a wide-base proliferation in the bladder.