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On the day a reporter observed him, Mr. Fitzmaurice moved quickly through the visits, many of which entailed procedures like biopsies and cryosurgery.

McNulty underwent cryosurgery, a procedure that freezes the retina back to the eye.

The 85-year-old New Yorker had cryosurgery and continues to follow Dr. Katz’s recommendations, so far with no evidence of cancer recurrence or spread.

Other basic treatment options include cryosurgery, or using liquid nitrogen to "freeze" the skin off, a simple surgical excision, laser treatments, and alternately scraping and burning the tumor.