title: [Cystic carcinoma of the prostate. Echographic diagnosis].
abstract: OBJECTIVE
  To analyze the incidence of cystic cancer in our series of patients with prostatic cancer diagnosed by US-guided transrectal prostate biopsy and to describe the clinical and ultrasound features.
  
  
  METHODS
  Of 497 cases of prostatic cancer diagnosed by US-guided transrectal biopsy, 369 (74%) showed a hypoechoic nodule, 15 (3%) had a hyperechoic nodule, 17 (3%) showed a mixed echogenicity, 3 (0.6%) had a cystic lesion and 96 (19%) were isoechoic. The 3 patients with cystic cancer of the prostate are analyzed.
  
  
  RESULTS
  In these three cases ultrasound showed a large, weakly echogenic, prostatic cystic lesion with mammillated margins. Punction-aspiration of the cyst yielded 20 and 7 cc of bloody liquid. The prostate was biopsied. Pathological analysis showed a typical prostatic adenocarcinoma in cases one and three; small areas of endometriod carcinoma were found in case two. The cytological analyses and cultures of the cystic liquid were negative in all three cases. Complementary studies were done; cases one and three were classified as disseminated tumor and case two as locally advanced tumor.
  
  
  CONCLUSIONS
  In our series, cystic carcinoma of the prostate accounts for 1% of prostate carcinomas. Punction-aspiration is advocated for prostatic cystic lesions with irregular margins. Bloody or dark cystic liquid warrants a prostate biopsy including cyst wall.
authors.affiliation: Servicio de Urología, Hospital General Universitario Gregorio Marañón, Madrid, España.
authors.forename: F
authors.initials: F
authors.lastname: Herranz Amo
authors.forename: J M
authors.initials: JM
authors.lastname: Díez Cordero
authors.forename: F
authors.initials: F
authors.lastname: Verdú Tartajo
authors.forename: G
authors.initials: G
authors.lastname: Bueno Chomón
authors.forename: F
authors.initials: F
authors.lastname: Leal Hernández
authors.forename: A
authors.initials: A
authors.lastname: Bielsa Carrillo
authors.forename: J
authors.initials: J
authors.lastname: García Burgos
mesh_terms: D000368:Aged; D001706:Biopsy; D003528:Carcinoma, Adenoid Cystic / Q000000981:diagnostic imaging* / Q000453:epidemiology; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D011471:Prostatic Neoplasms / Q000000981:diagnostic imaging*; D013030:Spain; D018084:Ultrasonography, Interventional