Was that under a general anesthetic?
I had 34 taken, but that was under general anesthetic and mainly targeted a specific area (anterior).
Before the current mpMRI scans, there used to be mapping biopsies, which is a type of transperineal template biopsy to sample all areas of the prostate. These were typically 100 cores.
With the development of effective transperineal local anesthetics over the past few years, they are doing transperineal biosies increasingly under local anesthetic.
The limit for TRUS was usually 12 samples, beyond which the patient becomes too uncomfortable.