The link Pratoman provided is a pretty good summary of the process.
The process is also called "water vapor thermal therapy" in general, and "transurethral water vapor thermal therapy" when applied to the prostate.
Searching this latter term provides some more articles.
Here's one that goes into great detail re the technicalities of the process:
https://www.blueshieldca.com/bsca/bsc/public/common/portalcomponents/provider/streamdocumentservlet?filename=prv_trans_h2o_vap_ther_benign_prostatic_hyper.pdf#:~:text=transurethral%20water%20vapor%20thermal%20therapy%20is%20a%20process,is%20repeated%20in%20multiple%20locations%20within%20the%20prostate.From it:
"Transurethral water vapor thermal therapy is a process by which water vapor is created outside of the body and delivered to the prostate with a needle. The procedure uses radiofrequency-generated water vapor (~103°C) thermal energy to ablate prostate tissue. The treatment is repeated in multiple locations within the prostate. During the procedure, saline irrigation cools and protects the surface of the urethra. The heat from the vapor disrupts cell membranes in the prostate, which leads to cell death and necrosis." And something that definitely caught my eye: the process is proposed as
"... an alternative to transurethral resection of the prostate (TURP)." So now we'll have a procedure that
steams the problem out instead of
cutting it out?
Whoa, I had my TURP way too soon!