Paratesticular adenomatoid tumors. The cytologic presentation in fine needle aspiration biopsies.

Adenomatoid tumors are the most common tumors of male paratesticular tissues (epididymis, tunica or spermatic cord) and have also been described in females (uterus, fallopian tube, ovary and paraovarian tissues); fine needle aspiration (FNA) of masses in these locations is increasingly utilized as an alternative to surgical exploration in order to establish a tissue diagnosis. This paper describes the FNA cytodiagnosis of seven cases of paratesticular adenomatoid tumors. The main cytologic criteria included epithelioid sheets and multilayered clusters of monotonous cells with round or ovoid, eccentric nuclei containing small, central nucleoli. Paranuclear clearing with a pink coloration (Giemsa stain) or a clear vacuolelike area (Papanicolaou stain) and abundant cellularity with a background of naked nuclei and stromal fragments were noted. The clinical presentation and clinicohistologic follow-up of these seven cases is also described in detail. A discussion of the differential diagnosis and the expected FNA findings is provided.