Papillary transitional cell bladder carcinoma and systematized epidermal nevus syndrome

Area of Science:

• Dermatology
• Oncology
• Genetics

Background:

• Epidermal nevus syndrome (ENS), a rare neurocutaneous disorder, is characterized by mosaicism and can present with various systemic findings.
• While ENS is known to associate with central nervous system abnormalities and internal malignancies, its link to bladder cancer is infrequently reported.

Observation:

• This report details a rare case of systematized epidermal nevi in a young woman who subsequently developed papillary transitional cell bladder carcinoma.
• The case underscores the importance of recognizing potential systemic associations in patients diagnosed with generalized epidermal nevi.

Findings:

• The co-occurrence of epidermal nevi and papillary transitional cell bladder carcinoma is exceptionally rare, with limited documented cases.
• The study suggests a potential, though not yet fully substantiated, molecular link between epidermal nevi and bladder cancer, possibly involving mutations in the fibroblast growth factor receptor 3 gene (FGFR3).

Implications:

• Patients with generalized epidermal nevi require thorough workups for associated central nervous system, musculoskeletal, genitourinary abnormalities, and internal malignancies.
• Further molecular research is necessary to elucidate the potential association between epidermal nevi and transitional cell bladder carcinoma, particularly concerning FGFR3 gene mutations.