Peer-reviewed veterinary case report
Horse has a neck mass - what could it be?
By Brown, Holly M et al.·Published in Veterinary clinical pathology·2007·Department of Pathology, United States·View original on PubMed →
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Original publication title: A subcutaneous mass on the neck of a horse.
- Species:
- horse
Plain-English summary
A 25-year-old Arabian gelding was brought in because of a lump on his neck. Tests showed that the lump was a mast cell tumor, which is a type of skin tumor that can occur in pets but is rare in horses. Fortunately, these tumors are usually benign and don't spread to other parts of the body. The best treatment is to surgically remove the tumor, which is expected to completely resolve the issue.
People also search for: horse neck lump · mast cell tumor in horses · treatment for horse skin tumors
Abstract
A 25-year-old Arabian gelding was presented for investigation of a subcutaneous neck mass. Fine-needle aspirates and impression smears revealed mast cells with widely varying degrees of cytoplasmic granulation and scattered eosinophils. Histopathology revealed a poorly circumscribed mass composed of sheets and bundles of mast cells with a large population of eosinophils. The mast cells were separated into numerous lobules by a heavy collagenous stroma, and multifocal collagen necrosis was present. Strong reactivity of the tumor cells for both Giemsa and toluidine blue stains confirmed the diagnosis of a mast cell tumor, and a Luna stain accentuated the eosinophilic infiltrates. Cutaneous mast cell tumors are found in many domestic animals but are uncommonly encountered in horses. Equine cutaneous mast cell tumors are usually benign, and there are no reports of visceral metastasis. Surgical excision is thought to be curative.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/17311206/