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Neurofibromatosis type 1 (NF1) is characterized by the progressive growth of neurofibroma from clinically small and non-visible lesions in the dermis of children to large non-esthetic lesions in adults.

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Hi

I can't say whether the technical terms are appropriate or whether the sentence is factual. In terms of grammar and spelling, I would put an 'a' at the beginning of aesthetic and I think I would try to make it clearer to the reader that the last two clauses are giving two examples - or specifying a range of origins of the symptoms. (Also, the UK government health website uses an 's' for the plural of neurofibroma, but I'm not sure if this is just a variation of acceptable spelling.)

- Neurofibromatosis type 1 (NF1) is characterized by the progressive growth of neurofibromas, either from clinically small and non-visible lesions in the dermis of children, or from large non-aesthetic lesions in adults.

To show that you are specifying a range is more difficult within one sentence. Maybe:

- Neurofibromatosis type 1 (NF1) is characterized by the progressive growth of neurofibromas; the sites of the symptoms on the skin can range from clinically small and non-visible lesions in the dermis of children to large non-aesthetic lesions in adults.

Hope this may help, Dave