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Choroidal melanoma in a dog

J V Schoster1, R R Dubielzig, L Sullivan

  • 1Department of Surgical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison 53706.

Journal of the American Veterinary Medical Association
|July 1, 1993
PubMed
Summary

A rare benign choroidal melanoma was diagnosed in a dog, presenting as a solid mass causing retinal detachment. This case highlights a rare ocular tumor in canines, emphasizing the need for thorough ophthalmic examination.

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Ophthalmic genetics·2019

Area of Science:

  • Veterinary Ophthalmology
  • Ocular Oncology
  • Canine Neoplasia

Background:

  • Melanocytic tumors are the most common primary ocular neoplasms in dogs.
  • Primary choroidal melanocytic neoplasms are exceptionally rare within this category.
  • Early detection and diagnosis are crucial for managing ocular conditions in animals.

Observation:

  • B-scan ultrasonography revealed complete retinal detachment and a solid mass originating from the optic disc in a 6-year-old dog's right eye.
  • Fine-needle aspirate biopsy showed mildly pleomorphic melanocytes.
  • Histopathology of the excised globe confirmed a large, heavily pigmented choroidal melanoma invading the optic nerve.

Findings:

  • The histologic diagnosis was a benign choroidal melanoma with optic nerve invasion.
  • The tumor presented as a semiconical mass projecting into the vitreal space.
  • Complete retinal detachment was associated with the choroidal mass.

Implications:

  • This case underscores the rarity of primary choroidal melanomas in dogs.
  • Accurate diagnosis through advanced imaging and histopathology is essential for appropriate treatment and prognosis.
  • Understanding rare ocular neoplasms aids in advancing veterinary ophthalmology and oncology.

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