Which characteristic describes a type 1 lesion in feline tooth resorption?

The characteristic that accurately describes a type 1 lesion in feline tooth resorption is a lucency in the tooth with normal periodontal ligament. In type 1 lesions, there is a localized area of resorption of dental tissue that appears radiographically as a radiolucent area within the tooth, indicating the loss of tooth structure while maintaining an intact periodontal ligament space.

This lesion type is often seen when the body begins to resorb the tooth structure due to conditions like periodontal disease or inflammatory responses. The presence of a clearly defined lucency signifies that the resorption is occurring strictly within the tooth, unlike more severe forms of resorption where the periodontal ligament might be affected and exhibit narrowing or loss.

Understanding this helps clarify the progression and radiographic interpretation of feline tooth resorption types, which is critical for effective diagnosis and treatment planning in veterinary dentistry.