Cangialosi L, Santaniello U, Ortoncelli M, Quaglino P, Ribero S. When IL-17 Blockade Backfires: Retropharyngeal Granuloma and Petrous Bone Osteonecrosis in a Patient with Psoriasis. Dermatol Pract Concept. 2026;16(2):6775. doi:10.5826/dpc.1602a6775