Which descriptor best characterizes benign lesions?

The correct descriptor for benign lesions is "circumscribed and pushing." Benign lesions typically exhibit well-defined borders, indicating that they are encapsulated and do not invade surrounding tissues. This circumscription allows for clear demarcation between the lesion and the normal tissue, which is a key characteristic of benign growths.

Additionally, benign lesions generally exhibit a pushing growth pattern rather than an infiltrative one. This means that as they grow, they displace adjacent tissues without infiltrating or invading them. This behavior contrasts sharply with malignant lesions, which tend to be poorly defined and often invade surrounding structures, making them more aggressive and challenging to manage.

The other descriptors provided reflect characteristics that are more associated with malignant lesions. For instance, poorly demarcated and invasive lesions are indicative of aggressive tumors that disrupt local tissue architecture. Likewise, necrotic and variegated features are often seen in tumors that undergo rapid growth and may outgrow their blood supply, leading to necrosis. Hemorrhagic and infiltrating characteristics further suggest malignancy, as they indicate aggressive behavior and potential spread to nearby tissues. Thus, "circumscribed and pushing" accurately captures the benign nature of these lesions.