title: Comparison of prostate and transition zone volume measured by the ellipsoid and planimetric methods with transrectal ultrasonography before seed implantation of prostate cancer.
abstract: A total of 122 men who were diagnosed with localized prostatic cancer underwent transrectal ultrasound and the volumes of their prostates and transitional zones were obtained using the planimetric method and the ellipsoid method. Mean age was 64.2 +/-13.4 (48.2-85.8), and mean preimplant prostate specific antigen was 6.01 +/- 2.35 mg/mL (0.92-15.5). The clinical stage was T1c in 70 patients, T2a in 46 and T2b in 6. Prostatic volumes and transitional zone volumes obtained by the planimetric method were 18 % and 39% greater than those obtained by the ellipsoid method, respectively. There were significant differences between the volumes obtained by the two different methods. However, there was a good correlation between the prostatic volume and the transitional zone volume obtained by both the ellipsoid method (r = 0.851) and the planimetric method (r = 0.908). The regression line of the prostate volume between these two methods was calculated as <Y = 0.92X + 8.4 (X: planimetry, Y: ellipspod)>.
authors.affiliation: Department of Urology and the UCSF/Mt Zion Comprehensive Cancer Center, University of California, San Francisco, California 94115, USA. iketetsu@m.ehime-u.ac.jp
authors.forename: Tetsuhiro
authors.initials: T
authors.lastname: Ikeda
authors.forename: Katsuto
authors.initials: K
authors.lastname: Shinohara
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001918:Brachytherapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D009929:Organ Size; D011467:Prostate / Q000000981:diagnostic imaging* / Q000473:pathology; D011471:Prostatic Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology / Q000532:radiotherapy; D014463:Ultrasonography