Penile squamous cell carcinoma in neurofibromatosis type 1 (NF1): RAS-pathway mechanisms and management - A case report.

Neurofibromatosis type 1 (NF1) predisposes to neural and occasionally epithelial malignancies. We report a 65-year-old man with NF1 who presented with urethral obstruction, meatal discharge, and glans swelling. Imaging identified a 22 × 25 mm hypervascular penile lesion invading the corpus spongiosum and anterior urethra. Biopsy confirmed well-differentiated squamous cell carcinoma. Staging showed no distant disease; inguinal FNA was negative. He underwent radical penectomy with perineal urethrostomy; margins were clear, and recovery was uneventful. This rare occurrence highlights RAS-pathway plausibility, supports prompt biopsy of changing genital lesions in NF1, and recommends HPV testing, molecular profiling, and multidisciplinary follow-up.