Case of the week 3.28.22

Adrien-Maxence Hespel

University of Tennessee

veterinary.radiology.mirc@gmail.com

Publication Date: 2022-03-28

History

6 year old Rottweiler. Lameness. Female spayed

2 images

There is an increase in soft tissue opacity within the left stifle joint, which has lobular, well-defined cranial margins, causing deviation and deformation of the infrapatellar fat pad. This opacity is also identified bulging the caudal capsule of the stifle joint.

There are focal, concave lucencies identified within the apex of the patella and proximal tibial condyles.

There is mild periarticular new bone formation associated with the left stifle joint. There is cranial deviation of the tibia in relation to the femur.

The lobular soft tissue opacity within the left stifle joint with concurrent osseous lysis is most concerning for joint associated neoplasia. Concurrent ligamentous injury cannot be excluded given the cranial deviation of the tibia.

Fine needle aspirates of the stifle were consistent with histiocytic sarcoma