title: An incidentally diagnosed prostatic ductal adenocarcinoma.
abstract: Ductal adenocarcinoma of the prostate was initially described in 1967 by Melicow and Patcher. It was given the erroneous name endometrioid carcinoma, however, further studies confirmed the prostatic origin of this tumor. Currently DAP is classified as a histological variant of prostatic carcinoma. Compared with "classic" acinar carcinoma of the prostate, DAP is a rare histological finding. It's prevalence in prostatectomy and biopsy specimens varies from less than 1% for pure ductal adenocarcinoma up to 5% for mixed DAP. Because of its typical periurethral location, the tumor usually manifests itself clinically with urinary obstruction, urinary urgency, urinary frequency and hematuria. DAP is associated with more aggressive natural history and worse prognosis than pure AA - patients presented at more advanced stage, with poorly differentiated and distant disease. DAP has a tendency to spread to regional lymph nodes, axial skeleton, and visceral organs. We report a case of a 90-year old man who presented to our clinic with acute urinary retention and gross hematuria. He underwent suprapubic transvesical adenomectomy to diminish the urinary obstruction. The pathological examination of the specimens revealed a dominant focus of DAP, which was located near the intraprostatic urethra and a coexisting, smaller component of "classic" acinar adenocarcinoma.
authors.affiliation: Urooncology Department, Maria Skłodowska-Curie Memorial Cancer Hospital, Warsaw, Poland.
authors.forename: Paweł
authors.initials: P
authors.lastname: Stajno
authors.affiliation: Urooncology Department, Maria Skłodowska-Curie Memorial Cancer Hospital, Warsaw, Poland.
authors.forename: Tomasz
authors.initials: T
authors.lastname: Kalinowski
authors.affiliation: Pathology Department, Maria Skłodowska-Curie Memorial Cancer Hospital, Warsaw, Poland.
authors.forename: Marcin
authors.initials: M
authors.lastname: Ligaj
authors.affiliation: Urooncology Department, Maria Skłodowska-Curie Memorial Cancer Hospital, Warsaw, Poland.
authors.forename: Tomasz
authors.initials: T
authors.lastname: Demkow
keywords: ductal adenocarcinoma; prostate