The investigators wish to determine the time to disease progression for benign neurofibromas treated with Levulan Kerastick topical photosensitizer and red light photodynamic therapy (PDT) in patients with neurofibromatosis type 1 (NF1). The investigators also wish to measure tumor size for control and treatment tumors in order to gain insights into tumor growth rates.
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Time to disease progression
Timeframe: 3 years