Cutaneous fungal granuloma in a horse.

This research describes a case of a horse with skin mass caused by a fungal infection, which significantly reduced in size after undergoing a combination of oral medication and laser surgery, with no recurrence at the site of treatment.

Introduction

• The research revolves around a case report that involved a four-year-old horse, which presented two cutaneous (related to the skin) masses located on the right crest of its neck.

Diagnosis Method

• A biopsy performed on the skin masses revealed chronic (long-term) nodular pyogranulomatous dermatitis and panniculitis. Pyogranulomatous dermatitis is an inflammation of skin tissues characterized by the formation of nodules while panniculitis refers to skin inflammation involving fat tissue.
• The diagnosis involved the use of Giemsa and periodic acid-Schiff (PAS) stains to highlight microorganisms for examination under a microscope. The stains revealed the presence of yeast-like organisms, signaling a fungal infection leading to the conclusion of cutaneous fungal granuloma – a type of chronic inflammatory reaction caused by a fungal infection.

Treatment and Outcome

• The afflicted horse was treated with oral Fluconazole – antifungal medication – for ten days and Potassium iodide – used in fungal cutaneous infections – for thirty days.
• The treatment managed to significantly reduce the size of the masses. The remaining masses post-medication treatment were then successfully removed using laser technology.
• Post-treatment, no recurring lesions or growths were observed at the site where the masses were present initially, indicating successful treatment.

Conclusion and Further Recommendations

• From the case report, the research concludes that fungal granuloma should be considered in the differential diagnosis of horses presenting with cutaneous or nodules beneath the skin – subcutaneous nodules.
• However, it further asserts that a definitive diagnosis can only be achieved through a histopathological examination, which involves studying the microscopic structure of diseased tissue, or by culture, where tissue samples are grown in a controlled environment that encourages the growth of the causative microorganisms.