For PAM, when is an excision biopsy indicated?

For PAM, when is an excision biopsy indicated?

• A. If the lesion spans more than 2 clock hours
• B. If the lesion spans more than 4 clock hours
• C. If the lesion spans more than 1 clock hour
• D. If the lesion spans more than 6 clock hours

Answer: (A)

In PAM the amount of conjunctival involvement guides how aggressively to pursue a tissue diagnosis. As the pigmented area covers more surface, the risk that there is dysplasia or malignant transformation increases, so sampling the lesion becomes important. Excisional biopsy is indicated when the lesion spans more than two clock hours because at that extent there is enough involvement to warrant histologic confirmation and to achieve clear margins if removal is pursued. This threshold helps distinguish small, likely benign lesions that can be watched from larger ones where there’s greater concern for atypia or melanoma. If the pigmented area is limited to two clock hours or less, careful observation with periodic documentation is often reasonable, with biopsy reserved for changes in size, borders, color, or the development of suspicious features.

In PAM the amount of conjunctival involvement guides how aggressively to pursue a tissue diagnosis. As the pigmented area covers more surface, the risk that there is dysplasia or malignant transformation increases, so sampling the lesion becomes important.

Excisional biopsy is indicated when the lesion spans more than two clock hours because at that extent there is enough involvement to warrant histologic confirmation and to achieve clear margins if removal is pursued. This threshold helps distinguish small, likely benign lesions that can be watched from larger ones where there’s greater concern for atypia or melanoma.

If the pigmented area is limited to two clock hours or less, careful observation with periodic documentation is often reasonable, with biopsy reserved for changes in size, borders, color, or the development of suspicious features.