Peer-reviewed veterinary case report
Firm lump in mammary gland of female dog diagnosed as fibromatosis
By Dos Reys, Marina P et al.·Published in Journal of comparative pathology·2024·Laborató, Brazil·View original on PubMed →
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Original publication title: Mammary fibromatosis in a female dog: case report.
- Species:
- dog
Plain-English summary
A 10-year-old mixed-breed female dog developed a firm mass in her right mammary gland. The veterinarian performed surgery to remove the lump, which was found to be a rare condition called mammary fibromatosis, characterized by abnormal growth of connective tissue. The mass was confirmed through microscopic examination. After the surgery, the dog was monitored for recovery, and further studies are needed to understand this condition better.
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Abstract
Fibromatosis, or desmoid tumour, is characterized by excessive and infiltrative proliferation of connective tissue originating from aponeurotic muscle structures. Mammary fibromatosis is rare in humans and animals and its precise aetiology is unknown. A 10-year-old mixed-breed female dog developed a mass in the right cranial thoracic mammary gland (M1) and underwent lumpectomy. The mass was firm, with an irregular surface and distinct limits. Microscopically, it was a neoplastic proliferation of fusiform cells with low atypia, interspersed with abundant dense collagenous tissue, confirmed by histochemical staining with Gomori's trichrome and Masson's trichrome and immunopositivity for vimentin and smooth muscle actin, confirming mammary fibromatosis. Mammary fibromatosis in dogs needs further studies to elucidate its clinical, epidemiological and aetiopathogenic aspects.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/38007888/