International Rhinologic Society Rhinology 0300-0729 2026 04 13 Anterior superior alveolar nerve dysfunction after lateral nasal wall surgery: a prospective observation EN A. MachadoDepartment of Otolaryngology, ULSTMAD, Vila Real, Portugal Faculdade de Ciências da Saúde – Universidade da Beira Interior, Covilhã, Portugal M. Castelo-Branco Sousa Faculdade de Ciências da Saúde – Universidade da Beira Interior, Covilhã, Portugal H.R. Briner ORL-Zentrum, Hirslanden Klinik, Zurich, Switzerland D. Simmen ORL-Zentrum, Hirslanden Klinik, Zurich, Switzerland Letter 3450 10.4193/Rhin26.046 The anterior superior alveolar nerve (ASAN), a branch of the infraorbital nerve, provides sensory innervation to the anterior maxilla, lateral nasal wall, and maxillary dentition. Owing to its anatomical proximity to the anterior maxillary wall and piri-form aperture, the ASAN is vulnerable during lateral nasal wall surgery. Although postoperative sensory disturbances such as gingival hypoesthesia or dental numbness are frequently re-ported, prospective data combining subjective symptoms with objective sensory testing across different surgical techniques remain limited .