Which surgical technique is specifically employed for gradual excision of malignant tumors?

Mohs' micrographic surgery is specifically employed for the gradual excision of malignant tumors, particularly skin cancers such as basal cell carcinoma and squamous cell carcinoma. This technique involves the systematic removal of cancerous skin in layers, with each layer being examined microscopically for cancer cells. If cancer is detected, another layer is removed and analyzed until no further cancerous cells are detected, ensuring that all the malignant tissue is excised while preserving as much healthy tissue as possible.

This approach not only allows for thorough removal of the tumor but also minimizes the chance of recurrence and optimizes cosmetic outcomes. Other surgical techniques mentioned, such as lymph node dissection, curettage, and cryotherapy, serve different purposes and are not focused specifically on the gradual excision of malignant tumors in the manner that Mohs' surgery is designed to do.