7 month old Lab with left pelvic limb lameness
On radiographs of the left stifle, there is a large radiolucent area in one condyle of the femur. On the craniocaudal projection, this appears to be located in the medial portion of the lateral condyle. There is a very mild contour irregularity of the cortex. There is increased soft tissue opacity within the joint indicating effusion. Differential diagnoses include developmental disease such as osteochondrosis or bone cyst, septic arthritis and osteomyelitis, trauma, and avulsion of a cruciate ligament. Diagnosis: Avulsion of the caudal band of the cranial cruciate ligament diagnosed at arthrotomy.
11 year old Labrador with history of maxillary neoplasia and forelimb lameness
Two radiographs of the right elbow are available for review. There is irregular sclerosis of the proximal ulna with an ill-defined lucent area parallel to the humero-ulnar joint. On nuclear scintigraphy with 99m-Tc-MDP, there is intense radiopharmaceutical uptake of the proximal ulna. The muscle mass surrounding the left thoracic limb is decreased. The left elbow is normal. Differential diagnoses include metastatic neoplasia, soft tissue tumor invading bone, fungal osteomyelitis, and primary bone tumor. Comment – this production is unusual in sarcomas or carcinomas of soft tissue unless there is bone infarction. Diagnosis: peripheral primitive neuroectodermal tumor. Biopsy was attempted twice with no definitive diagnosis. There was radiographic progression with pathologic fracture 10 months later. The diagnosis was obtained post-mortem.
10 year old FS Golden Retriever with inappetance, anorexia and intermittent and mild cough.
Thoracic radiographs show increased soft tissue opacity in the ventral thorax, located cranial and ventral to the cardiac silhouette. There is a mild bronchointerstitial pattern. There is a very small amount of pleural effusion, and the edges of the soft tissue mass are angular and displacing the lung margins dorsally. Differential diagnoses include pleural or mediastinal neoplasia and inflammatory mediastinal disease (fungal, migrating foreign body). Diagnosis: Mesothelioma.
9 year old female warmblood horse with weight loss after medical colic 1 month ago
Images of the left 13th intercosal space and left ventral abdomen are presented. The stomach is visible as a hypoechoic line with hyperechoic gas in the lumen. The stomach appears enlarged and extends beyond the costochondral junctions. The wall is thickened at 1.5 cm (normal 8 mm). The spleen is being displaced caudally by the enlarged stomach. Differential diagnoses: gastric outflow obstruction, gastric impaction. Diagnosis: gastric impaction.
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