Diagnosis of Neurofibromatosis Type 1 (NF1)

1. Six or more café au lait macules over 5 mm in greatest diameter in prepubertal individuals and over 15 mm in greatest diameter in postpubertal individuals

2. Two or more neurofibromas of any type or one plexiform neurofibroma

3. Freckling in the axillary or inguinal regions (Crowe´s sign)

4. Optic glioma

5. Two or more Lisch nodules (iris harmartomas)

6. A distinctive osseous lesion such as sphenoid dysplasia or thinning of long bone cortex with or without pseudoarthrosis

7. A first-degree relative (parent, sibling, or offspring) with NF1 by the above criteria

The criteria are met in an individual if two or more of the features listed are present.

 

Diagnosis of Neurofibromatosis Type 2 (NF2)

1. Bilateral masses of the eighth cranial nerve seen with appropriate imaging techniques (e.g., CT or MRI)

2. A first-degree with NF2 and either:

a)       Unilaterial mass of the eighth cranial nerve, or

b)       Two of the following:

·         Neurofibroma

·         Meningioma

·         Glioma

·         Schwannoma

·         Juvenile posterior subcapsular lenticular opacity

 

The criteria are met by an individual who satisfies condition 1 or 2.