Final answer:
The incision used in a TURP procedure is a transurethral incision. This involves inserting a resectoscope through the urethra with no external cuts.
Step-by-step explanation:
The incision used when performing a Transurethral Resection of the Prostate (TURP) is the transurethral incision. During this procedure, no external incision is made. Instead, a resectoscope is inserted through the urethra to remove the excess prostate tissue that is causing symptoms like urinary retention. TURP is a common treatment for benign prostatic hyperplasia (BPH).