Rare Canine Tumor: Ossifying Chondrolipoma in a Labrador

Case Report: Ossifying Chondrolipoma in a 3‐Year‐Old Labrador

Kylee Goggin, Keren Dittmer, Emily Short

Background
Lipomas are common benign mesenchymal tumors in dogs, but ossifying chondrolipomas—lipomas containing cartilage and bone—are extremely rare. This case report describes a 3-year-old Labrador Retriever diagnosed with an ossifying chondrolipoma, emphasizing its clinical presentation, imaging characteristics, surgical approach, and histopathological findings. The objective is to highlight this rare tumor as a differential diagnosis for fat-attenuating masses with mineralized components in dogs.

Methods
A 3-year-old neutered male Labrador Retriever was evaluated for a painless, palpable mass on the right shoulder. Computed tomography (CT) was performed with pre- and post-contrast imaging. The mass was surgically excised and submitted for histopathology, which confirmed the diagnosis. The patient was monitored postoperatively for recurrence.

Results
CT imaging revealed a well-defined intramuscular mass with fat, soft tissue, and mineralized components. Differential diagnoses included liposarcoma, necrotic lipoma with dystrophic calcification, and chondro-osteolipoma. The excised mass consisted of well-differentiated adipocytes interspersed with chondrocytes and mineralized trabeculae, confirming an ossifying chondrolipoma. The dog recovered without complications, and at the 6-month follow-up, no recurrence was detected.

Limitations
This case report is limited by the single-subject study design, preventing broader conclusions about the prevalence and behavior of ossifying chondrolipomas. Additionally, long-term outcomes beyond six months remain unknown, requiring further follow-up or additional case studies.

Conclusions
Ossifying chondrolipoma is a rare but benign tumor that should be considered when evaluating soft tissue masses with mineralization in dogs. CT imaging is valuable for surgical planning, and complete excision appears curative. This case highlights the importance of integrating imaging, histopathology, and surgical management for accurate diagnosis and treatment of rare neoplasms.

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