Diagnosis and management of a malignant granulosa cell tumor in a holstein nulligravida: a case study.

The research article discusses a case study where an enlarged ovary in an 18-month-old Holstein cow was diagnosed as a malignant granulosa cell tumor (GCT), and how it was successfully treated to allow the cow to get pregnant.

Case Details

• The case involved an 18-month-old Holstein cow (nulligravida) that was not exhibiting natural signs of heat cycle (anestrous).
• During an internal examination via the rectum (transrectal palpation), an enlarged left ovary was discovered.
• Ultrasound imaging of the enlarged ovary showed similarities to images of known granulosa cell tumors in horses.

Progression Of Symptoms

• Over time, the cow displayed physical signs typically associated with male hormones (virilism), such as increased muscle mass and changes in voice.
• 55 days post the initial diagnosis, a surgical procedure was performed to remove one ovary (unilateral ovariectomy).
• Before the surgery, an analysis showed the cow had a serum testosterone concentration equivalent to that of a mature bull.

Treatment Outcomes

• Within three months of the surgery, there were noticeable positive changes in the cow’s condition. It began to exhibit regular heat cycles (estrus expression resumed) and the testosterone levels returned to normal.
• The cow became pregnant after artificial insemination (AI) was successfully performed.
• The final diagnosis after detailed tissue examination (histopathology) confirmed a low-grade malignant granulosa cell tumor.

Diagnosis Recommendations

• The research concluded that the clinical diagnosis of granulosa cell tumor in cows should involve ultrasound imaging as well as steroid hormone assay, a biochemical test to detect hormone levels.
• An ultrasound image, similar to the one encountered in this case study, may be characteristic of granulosa cell tumors in cows.