Which type of basal cell nevus is considered premalignant?

The junctional type of basal cell nevus is considered premalignant due to its potential for dysplastic features and its association with other neoplastic lesions. Junctional nevi typically occur at the junction of the epidermis and dermis, allowing it to have cellular changes that can indicate a progression towards malignancy.

In contrast, other types of basal cell nevi, such as nodular or superficial, are generally benign and do not exhibit the same dysplastic characteristics or a significant risk of developing into invasive cancer. The infiltrative type may present with more aggressive local behavior, but it does not share the premalignant status attributed to junctional nevi as it is typically more invasive rather than being classified in the same manner with respect to malignancy potential. Understanding these distinctions is key to assessing the risks associated with different types of nevi.