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Prevalence and Significance of Heterogeneous Testes Revealed on Sonography

Ex Vivo Sonographic—Pathologic Correlation

¹ Department of Radiology, Dartmouth-Hitchcock Medical Center, One Medical Center Dr., Lebanon, NH 03756.
² Dartmouth Medical School, Hanover, NH 03755.
³ Present address: 17509 59th Ave., N.W., Edmonton, Alta., T6MIHI, Canada.
⁴ Department of Pathology, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756.

OBJECTIVE. Heterogeneous or mottled testes in middle-aged or elderly men are often encountered on sonography. To determine the prevalence, cause, and significance of this finding, we examined 50 testes (25 pairs) from autopsy specimens with sonography and gross and microscopic pathology.

SUBJECTS AND METHODS. Testicles were obtained at autopsy from a series of 25 male cadavers (age range, 16-80 years; mean, 62 years). Eight subjects had a history of cancer. Ex vivo sonography was performed and two board-certified radiologists graded the testis by consensus as normal, heterogeneous, or "other abnormality" (cyst, dilated rete, echogenic focus, or halo). Microscopic pathology was obtained in all abnormal (sonographic or gross pathologic) testes. The severity of tubular sclerosis (atrophy) was graded on a scale of 0-3+ by a uropathologist.

RESULTS. No testicular tumors were detected. Sonography revealed normal testes in 33 specimens, heterogeneous in seven specimens, and other in 10 specimens (one cyst, two dilated rete, three halos, and seven echogenic foci). Histology revealed that all seven cases of mottled or heterogeneous testis corresponded to extensive (grades 2 and 3) regions of tubular sclerosis (atrophy). A new sonographic finding of the "halo" was attributable to a thickened, adherent tunica albuginea.

CONCLUSION. The prevalence of heterogeneous testes in this elderly population was 14% and represented seminiferous tubule atrophy and sclerosis. The prevalence of clinically occult testicular cancer or metastases in this autopsy subject group was nil. Older patients with a mottled or heterogeneous testis, normal color Doppler flow, and no palpable abnormality probably do not need sonographic follow-up.

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