Management of Familial Benign Café au Lait Macules

Diagnostic Evaluation

• The American College of Medical Genetics recommends counting and measuring all café au lait macules precisely, with ≥6 spots with ≥5mm prepubertal or ≥15mm postpubertal meeting one NIH criterion for NF1, to document the complete phenotype and avoid misdiagnosis 1
• A thorough skin examination for cutaneous or subcutaneous neurofibromas should be performed, with their absence being a key distinguishing feature between familial CALMs and NF1 1

Genetic Testing and Counseling

• Genetic testing can definitively distinguish familial CALMs from NF1 and guide appropriate counseling, with NF1 gene testing able to confirm or exclude NF1, and testing for Legius syndrome (SPRED1 mutations) also being considered 1
• The National Society of Genetic Counselors emphasizes that familial CALMs do not carry the 8-15 year reduction in life expectancy associated with NF1, and that there is a 50% autosomal dominant inheritance risk for offspring 2

Surveillance and Screening

• The American Academy of Dermatology recommends annual dermatologic examination to monitor for any new skin lesions, particularly neurofibromas, but no routine imaging (MRI, CT) or specialized NF1 clinic referral is required 1
• No screening for pheochromocytoma, MPNST, or other NF1-associated malignancies is necessary, and no enhanced breast cancer screening protocols are required 1

Red Flags and Re-evaluation

• The development of any cutaneous or subcutaneous neurofibromas, new neurologic symptoms, bone abnormalities, or vision changes in children warrants immediate reassessment for possible NF1 1, 3