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Malignant seminoma in a cryptorchid stallion
B L Smith1, L D Morton, J P Watkins
1Department of Large Animal Medicine, Texas Veterinary Medical Center, Texas A&M University, College Station 77843.
Insights
A 16-year-old cryptorchid horse experienced colic due to a large pelvic mass. Surgical removal of the seminoma led to fatal exsanguination, with metastasis found postmortem.
Area of Science:
- Veterinary Oncology
- Equine Surgery
Background:
- Cryptorchidism in horses can predispose to certain neoplasms.
- Colic is a common presenting sign for abdominal masses in horses.
Observation:
- A 16-year-old cryptorchid horse presented with colic and a large, lobulated soft-tissue mass near the pelvic inlet.
- Two large, multilobulated pedunculated masses were surgically removed.
Findings:
- The masses were diagnosed as malignant seminoma.
- A major blood vessel was damaged during surgery, leading to exsanguination.
- Postmortem examination confirmed widespread metastasis of the seminoma.
Implications:
- Malignant seminoma is a potentially aggressive tumor in horses.
- Surgical intervention for large abdominal masses carries significant risks, including hemorrhage.
- Early detection and diagnosis are crucial for managing equine neoplasms.
Abstract:
A 16-year-old cryptorchid Quarter House with colic had a large, lobulated soft-tissue mass to the left of the pelvic inlet. At surgery, 2 large multilobulated pedunculated masses were removed. A large blood vessel enveloped by one of the masses was damaged, and the horse exsanguinated. Postmortem examination of the abdomen revealed the masses to be malignant seminoma, with multiple sites of metastasis.