Presentation
Presents for evaluation of a stifle mass.
Patient Data
Age: 14 years
Gender: Castrated male
Category: Domestic dog
Organism: Australian cattle dog
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There is increased fat opacity between the gastrocnemius muscle and the digital flexor muscle, causing a mass effect. The fat opacity mass extends medial, lateral, and caudal to the stifle and tibia. The distal extent of the mass is difficult to appreciate. The stifle joint and popliteal lymph node appear normal.
Case Discussion
The mass was surgically resected and lacked a defined capsule in one region. It was characterized as an infiltrative lipoma.
A fat opacity mass is consistent with a lipoma, infiltrative lipoma, or liposarcoma. The key finding on the radiographs is recognizing that the mass is fat opacity rather than soft tissue, and is separating muscle layers.
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