Fine needle aspiration of seminal vesicles: aspects of normal seminal cells.

Seminal vesicle cytology was studied in 18 patients admitted with diseases of the prostate, in whom fine needle aspiration by transrectal route was performed. Three cell-types are described: principal, basal and degenerative forms. Nuclear and cytoplasmic peculiarities of the principal and basal cells are revealed, discussing their value in the differential diagnosis from well-differentiated carcinoma of the prostate. It is emphasized the importance of pseudoatypical aspects of seminal cells--considered as a source for false positive results in FNAB of the prostate.