What does left apex mean?

Biopsy report says PCa found in left base, left mid and left apex, etc, etc   Does apex mean the same as neck as in upper prostate neck itself or the area closest to or adjoining the bladder neck or what? 

Thanks

James C.

Apex mid and base. Sounds like top to bottom but it's the opposite. The base is nearest the bladder. The apex is closest to the penis. It is also the most common flare location for PCa. The prostate is considered two lobes. Thus left would be your left side closest to the rectum. Not sure why but there is no "capsule" in the area of the apex. I believe that it is because this is where the facia tissue integrates with the muscle tissue and the prostate. Thus this is the most common location for extraprostatic extension. The seminals which integrate through the base of the prostate are the first evidence of metastatic disease. Cancers that begin in the apex and spread to the seminals are indicative that the cancer has metastisized and no longer depends on the prostate tissue.

See Figure 1:
http://www.prostate-cancer.org/education/localdis/brosman_RP2003.html

T