A rare malignancy: A case report of early progression of anal Buschke–Löwenstein tumor into squamous cell carcinoma in an immunocompetent patient

Buschke-Löwenstein tumor (BLT) is a rare perianal lesion caused by low-risk mucosal HPV 6 or 11 but less frequently associated with high-risk HPV types. It is a large, exophytic, verrucous lesion of the anogenital region. BLT presents as a benign tumor but exhibits malignant clinical behavior and has a high rate of local recurrence and malignant transformation. The optimal treatment approach for BLT is still debated due to the lack of consensus. Various therapeutic modalities have been proposed, including topical agents, surgical excision, immunotherapy, chemo-radiotherapy, and electrocoagulation.