In fifty ICM-affected calves examined in an expanded study that included referred cases, investigators found spongy change in the cerebellar white matter in only one subject. The cause of this lesion was not established. However, given its uncommon appearance in ICM-affected calves, the lesion was most likely associated with another unrecognized insult to the individual.
The contents of Table 1 show that lesions in the coxae were a common finding in hyperekplexic calves. They include deep linear contusions in the cranial portion of the acetabular fossa, and erosions of the corresponding articular surface of the head of the femur. Some erosions were so deep that the hyperemic subendochondral bone was exposed. Fragments of bone were encapsulated in close proximity to fractures of the femoral neck. Investigators also frequently observed hemorrhage and fibrosis in the joint capsule and surrounding tissue (Harper et al., 1986a). The severity of the hip joint lesions is evident on the X-ray images depicted in the video. No other pathology has been associated with ICM.
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