Intra-abdominal hemorrhage associated with a granulosa-thecal cell neoplasm in a mare.

An unexpected case of severe internal bleeding caused by a rare ovarian tumor (granulosa-thecal cell neoplasm) in a 9-year-old American Saddlebred horse led to extensive abdominal distention and pain, and ultimately, euthanasia.

Introduction and Clinical presentation

• The research discusses the case of a 9-year-old American Saddlebred mare that was referred to a veterinarian because of abdominal distention (swelling) and signs of abdominal pain.
• Through abdominocentesis, a procedure that extracts fluid from the abdomen, a large volume of what appeared to be blood was found.
• A large mass was detected at the distal tip of the right uterine horn of the mare upon rectal and ultrasonographic evaluation of the abdomen.

Diagnosis and prognosis

• The horse was euthanized due to its poor prognosis and post-mortem examination (necropsy) was conducted.
• The mass was determined as a granulosa-thecal cell neoplasm. This particular type of tumor originates from the granulosa and theca cells in the ovaries.

Discussion on Granulosa-thecal cell neoplasm

• The most common clinical sign of granulosa-thecal cell neoplasm in horses is infertility or abnormal sexual behavior, making the symptoms shown by the mare in this case quite unusual.
• While intra-abdominal hemorrhage, or hemoperitoneum, is rarely associated with neoplasms (tumors) in horses, it was implicated in this case. This suggests that more research is needed to understand the variations in clinical presentation of this type of neoplasm and to improve diagnostic and treatment strategies.