Photomicrograph of a section of one of the affected spinous processes removed from the dog described in Figure 1. There is a thick zone of hyaline cartilage with layers of endochondral ossification (asterisk) consistent with the finding of peripheral hyperintense signals on T2-weighted STIR images. Overlaying this cartilage cap is a layer of fibrous stroma (periosteum; arrows). The marrow cavity of the mass is contiguous with the underlying bone (bracket). All spinous processes examined histologically had similar microscopic features. H&E stain; bar = 1,000 µm.
Citation: Journal of the American Veterinary Medical Association 260, 1; 10.2460/javma.19.11.0583