How to Perform a Transvaginal Ovarian Biopsy

Transvaginal Ovarian BiopsyClaire Card, DVM, PhD, DACT; Mariana Diel de Amorim, DVM, DVSc, DACT; and Maria Lopez Rodriguez, DVM

The size of the mare and the deep abdominal position of the ovaries means that diagnostic modalities such as MRI and CT are problematic for use in determining the nature of an ovarian abnormality. However, full-body scans for CT and MRI are available at a few locations in North America. Surgical removal of the suspected abnormal ovary, or both ovaries in case the abnormal ovary cannot be identified, is often performed as it usually provides a definitive diagnosis, and it may be curative. Bilateral ovariectomy, however, does not preserve the mare’s fertility. There are select cases where an ovarian biopsy would be useful to determine which ovary is affected by neoplasia; if both ovaries are neoplastic; or to identify the nature of an ovarian abnormality prior to invasive, and irreversible ovariectomy.

This two-part course consists of one proceedings paper and the accompanying 2019 AAEP Convention presentation. The video has been split into two parts for ease of download and viewing; as one video part concludes, the next will unlock.

You must view all sections of the course before the quiz will unlock.

Course objectives:

With the successful completion of this course, students will be able to

  • identify the need for TVOB
  • understand the equipment needed
  • recognize the differences between one-step and two-step procedures
  • watch for potential complications

Continuing education credit:

  • 0.5 credit hour Medical, Non-interactive/Anytime, with a passing score of at least 70%

Approximate duration:

  • 30 minutes: view the presentation, read the paper, pass the quiz


  • Read the paper from the 2019 AAEP Convention proceedings, approximately 4,200 words
  • View the presentation from the 2019 AAEP Convention, 20 minutes
  • Complete quiz
How to Perform a Transvaginal Ovarian Biopsy00:18:25
View presentation, part 1 00:06:45
View presentation, part 2 00:11:40
Read the paper from the 2019 AAEP Convention proceedings
Pass the quiz to earn CE credit
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