.   first introduced laparoscopic surgery in the field of urology , progress in laparoscopic radical surgery has been remarkable in urologic oncology .
advances in surgical instruments and techniques have made incision , resection and coagulation easier , enabling the application of this procedure to be extended up to radical prostatectomy .
laparoscopic radical prostatectomy ( lrp ) has been widely used as a minimally invasive surgery since its introduction by schuessler et al . .
the advantages of lrp include decreased postoperative pain , earlier return to daily activities due to minimally invasive surgical wound , shorter hospital stay , decreased blood loss , earlier recovery of potency and an oncological outcome similar to that of open radical prostatectomy ( orp ) .
.   demonstrated that lrp is beneficial in the preservation of the urethral sphincter and nerves due to the wide surgical field , resulting in the restoration of continence and potency .
recently , laparoendoscopic single - site ( less ) surgery , by which surgical instruments can be introduced through a single incision , has improved the esthetic outcome and has replaced conventional laparoscopic surgery .
we report herein our initial experience and reason for conversion of less radical prostatectomy ( lessrp ) , using a homemade single - port device , to conventional lrp , with a schematic surgical illustration .
the patient complained of frequency intervals of 1 - 2 h and nocturia of 3 times per night . before this presentation ,
digital rectal examination had revealed bilateral enlargement of the prostatic lobes . under a clinical diagnosis of benign prostate hyperplasia
after medical treatment , his serum prostate - specific antigen was 4.11 ng / ml , which was a 4-fold increase from the baseline prostate - specific antigen . he underwent a 12-core transrectal ultrasonography ( trus)-guided prostate biopsy , which showed a localized prostate cancer ( pca ) with a gleason score of 7 ( 3 + 4 ) in the bilateral peripheral zones .
magnetic resonance imaging for tumor staging revealed benign prostate hyperplasia and hematoma due to trus - guided biopsy , and bone scintigraphy displayed no bony metastasis .
we decided to perform a radical prostatectomy under a diagnosis of localized pca ( clinical stage t2cn0m0 ) .
informed consent was obtained after a complete description of the various surgical procedures including orp , lrp , robot - assisted lrp ( ralrp ) and lessrp using a homemade single - port device . under general anesthesia ,
the operator stood on the left side of the operating table , and 2 assistants stood on the right side .
after a 3-cm vertical skin incision was made in a crease just superior to the umbilicus , dissection was performed up to the peritoneum .
a homemade single - port device was prepared using a small alexis wound retractor ( applied medical , rancho , santa margarita , calif . ,
usa ) and a powder - free surgical glove ( triplex p - free glove , km healthcare , guri , korea ) .
after the wound retractor was inserted through the incision site , the ring of the wound retractor was covered with a 6/2 surgical glove , which was rolled over around the ring , and the glove was forced to completely touch the abdominal wall . after cutting out 3 fingers of the glove , two 12-mm trocars and one 5-mm trocar were fixed with 1 - 0 silk suture material . in a steep trendelenburg position ,
a 30-degree 10-mm rigid laparoscope was introduced into the center trocar , and the other 2 trocars were used for flexible laparoscopic instruments ( laparoangle , cambrige endo , framingham , mass . , usa ) and conventional rigid instruments .
lessrp was performed using the homemade single - port device in the same manner as conventional lrp ( fig .
an additional 12-mm port was created by cutting out another finger of the surgical glove because there was interference between the flexible laparoscopic instruments during vesicourethral anastomosis after the resection of the prostate and seminal vesicle ( fig .
however , since the working space for the anastomosis and adequate angles between the instruments was not maintained , another two 12-mm transcutaneous ports were created above the anterior superior iliac spine on both sides , so that the procedure was converted to conventional lrp ( fig .
when a cystography performed 7 days after surgery showed no urine leakage , the catheter was removed .
4 ) , and the pathological examination of the surgical specimen revealed pca with a gleason score of 7 ( 3 + 4 ) reflecting prostatic cancer invasion ( pt3a ) . until now
, the patient has been healthy for nine months postoperatively and treated with gnrh agonists and antiandrogens .
however , this method has the disadvantages of difficulty in maintaining the surgical field , intraoperative bleeding , postoperative pain / thromboembolism / incontinence / erectile dysfunction and increased hospitalization . to solve these problems of orp
however , lrp has the disadvantages of a longer operation time and the necessity for good familiarity with the surgical procedure .
the disadvantages of ralrp are the requirement of an expensive da vinci robotic system ( intuitive surgical , mountain view , calif . , usa ) and a high surgeon 's fee compared to orp or lrp in korea .
previous studies have proposed that the lrp may aid in the fine dissection of neurovascular bundles and facilitate a higher quality of watertight vesicourethral anastomosis .
recent operations have been directed toward scar - free procedures , and thus new terms ,  natural orifice translumenal endoscopic surgery ( notes ) or  less have been coined .
less surgery , a laparoscopic surgery through a single incision site , was proposed as a new term after the 2008 laparoendoscopic single - site surgery consortium for assessment and research ( lesscar ) . in the field of urology ,
rane et al .   reported the first case of less nephrectomy using an r - port ( advanced surgical concepts , dublin , ireland ) at the 2007 world congress of endourology meeting .
thereafter , many surgeons have applied this technique to various urological diseases and have reported its usefulness and safety .
.   stated that less simple prostatectomy using an r - port is more difficult than the conventional laparoscopic procedure with a total operation time of 120 min .
reported 4 cases of lessrp using a uni - x single laparoscopic port system ( pnavel systems , morganville , n.j .
they reported a mean operation time of 285 min , a mean estimated blood loss of 287 ml and a mean duration of catheter placement of 14 days . in our lessrp using a homemade single - port device together with lrp , the operation time was 610 min , and the estimated blood loss was approximately 600 ml .
first , it does not allow the laparoscope and instruments to be moved freely in a limited space .
third , the long distance between the homemade single - port device and the symphysis pubis is also a problem in suturing .
for those reasons , we could not perform precise vesicourethral anastomosis and converted to conventional lrp in the current case .
it is thought that , although our technique may require a greater learning curve than conventional lrp and may increase operation time , new flexible or multifunctional laparoscopic instruments will make lessrp feasible and easier .
 we report an initial experience in laparoendoscopic single - site radical prostatectomy ( lessrp ) using a homemade single - port device for prostate cancer . 
 a 63-year - old man was diagnosed with prostate cancer . 
 the patient underwent lessrp using an alexis wound retractor , which was inserted through an umbilical incision . 
 a homemade single - port device was made by fixing a 6 1/2 surgical glove to the retractor 's outer ring and securing the glove finger to the end of 4 trocars with a tie . using the flexible laparoscopic and rigid instruments , 
 lessrp was performed using a procedure similar to conventional laparoscopic radical prostatectomy ( lrp ) . in the current case 
 , we could not perform complete lessrp , so we report our initial experience and consider the reason why laparoendoscopic single - site surgery was converted to conventional lrp . 