Active lesions of chorioretinitis exhibit which of the following characteristics?

Active lesions of chorioretinitis are characterized by their appearance, which often includes being poorly circumscribed and raised. This reflects the inflammatory processes occurring in the retina and choroid. In cases of chorioretinitis, inflammation can lead to edema and a thickening of the retinal layers, resulting in raised lesions that are not well-defined.

The poorly circumscribed nature indicates that the inflammation is diffuse and may lead to irregular borders, as opposed to a well-defined, circumscribed lesion which typically indicates a more stable or chronic process. The raised characteristic suggests ongoing activity, such as inflammatory cell infiltration, as opposed to scarring or resolution which would display flattened or depressed lesions.

While other characteristics mentioned in different options may be seen in various stages or forms of retinal disease, the key defining features of active chorioretinitis lesions are the poorly circumscribed and elevated nature of the lesions, indicating that the condition is ongoing and potentially changing. This understanding is crucial for veterinarians when making diagnostic decisions and determining the severity of the ocular condition.