Return to Cylicity After Diagnosis of Granulosa Cell Tumor in 16 Month Old Simmental Heifer

A 16 month old Simmental heifer was presented with history of udder development and masculine behavior. A left ovarian mass was confirmed via transrectal palpation and ultrasonography revealed a 10cm by 7cm cavitated mass typical in appearance to a granulosa-theca cell tumor (GTCT) and an abnormally small right ovary. Granulosa-theca cell tumors are rare; one study of 1489 slaughter cattle showed GTCT incidence rate of 0.7%. If present in bovine species it is more commonly reported in lactating dairy cattle and rarely in beef heifers. [...]