Peer-reviewed veterinary case report
Adult-type rhabdomyoma tumors under the skin in two dogs
By Paździor-Czapula, Katarzyna et al.·Published in Veterinary clinical pathology·2023·Department of Pathological Anatomy·View original on PubMed →
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Original publication title: Extracardiac adult-type rhabdomyoma-Report of two cases in dogs.
- Species:
- dog
Plain-English summary
A 14-year-old female Border Collie and a 13-year-old male Mongrel were both found to have unusual tumors in their skin. The tumors were discovered after a vet performed a fine-needle aspiration biopsy, which showed abnormal cells that looked like they could be from an epithelial tumor. However, after surgery to remove the tumors and further testing, both dogs were diagnosed with adult-type rhabdomyoma, a type of tumor that can form in muscle tissue. Thankfully, both dogs had their tumors successfully removed, and the diagnosis helped clarify the nature of the growths.
People also search for: dog skin tumor Border Collie · rhabdomyoma in dogs · dog tumor surgery recovery
Abstract
This report describes the cytologic, histopathologic, and immunohistochemical features of adult-type rhabdomyoma located within the subcutaneous tissue in a 14-year-old female Border Collie (thigh) and a 13-year-old male Mongrel (flank). In both cases, fine-needle aspiration biopsy revealed cluster-forming, epithelial-like polygonal cells with abundant foamy cytoplasm, and moderate to marked anisocytosis and anisokaryosis; therefore, an epithelial tumor was suspected. After surgical excision, tumors underwent histopathologic examination with additional immunohistochemistry. Both tumors were well-demarcated and located within the subcutaneous tissue in the vicinity of the cutaneous muscle. The tumor mass consisted of densely packed round or polygonal cells with distinct vacuolation of the cytoplasm. Tumor cells expressed vimentin, desmin, and NSE and were cytokeratin and α-SMA negative. Based on histologic features and immunophenotyping, adult-type rhabdomyoma was diagnosed in both cases. This study highlights that the cytologic features of rhabdomyoma can be misleading and may suggest an epithelial tumor.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/37914534/