Synovial myxosarcoma in the scapulohumeral joint of a dog: a case report

A 12-year-old, 3 kg spayed female mixed-breed dog was evaluated to assess a 1-year history of intermittent right forelimb lameness that did not have adequate response to nonsteroidal anti-inflammatory drugs. The radiographic study performed under sedation showed multifocal radiolucent areas affectin...

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Bibliographic Details
Published in:Veterinary research communications 2024-08, Vol.48 (4), p.2827-2833
Main Authors: Mínguez-Pereira, Elena, Martín-Carrasco, Laura, García-Fernández, Rosa Ana, Fraile-Fernández, Andrés, Ortiz-Diez, Gustavo, Martínez-de Merlo, Elena, García-Real, María Isabel
Format: Article
Language:English
Subjects:
Animals
Anti-inflammatory agents
Biomedical and Life Sciences
Biopsy
Brief Report
Case reports
Computed tomography
Dog Diseases - diagnosis
Dog Diseases - diagnostic imaging
Dog Diseases - pathology
Dog Diseases - surgery
Dogs
Drug development
Female
Humerus
Lameness, Animal - etiology
Life Sciences
Myxosarcoma - diagnosis
Myxosarcoma - pathology
Myxosarcoma - surgery
Myxosarcoma - veterinary
Sarcoma, Synovial - diagnosis
Sarcoma, Synovial - diagnostic imaging
Sarcoma, Synovial - pathology
Sarcoma, Synovial - veterinary
Scapula
Scapula - diagnostic imaging
Scapula - pathology
Synovial sarcoma
Veterinary Medicine/Veterinary Science
Zoology
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Description
Summary:A 12-year-old, 3 kg spayed female mixed-breed dog was evaluated to assess a 1-year history of intermittent right forelimb lameness that did not have adequate response to nonsteroidal anti-inflammatory drugs. The radiographic study performed under sedation showed multifocal radiolucent areas affecting both the right humerus and scapula with focal soft tissue swelling; a CT scan confirmed the existence of an aggressive and invasive soft tissue mass affecting the scapulohumeral joint. Fine needle aspiration results suggested a low-grade synovial sarcoma and therefore a scapulectomy was performed. The biopsy showed spindle to stellated cells immersed in a basophilic and mucinous (myxoid) matrix with mild to moderate anisocytosis, moderate anisokaryosis, some binucleated cells and sporadic multinucleated cells. These findings are consistent with low-grade synovial myxosarcoma, a not well described synovial neoplasm that can mimic other commonly seen joint tumors or even septic arthritis on radiographs. The purpose of this case report is to describe the first reported synovial myxosarcoma affecting the scapulohumeral joint of a small dog.
ISSN:0165-7380
1573-7446
1573-7446
DOI:10.1007/s11259-024-10430-z