“…Such ischemic process may be induced by direct trauma (Birkholz et al, ; Brannon et al, ; Giles, ), local anesthetics (Brannon et al, ; Grillon & Lally, ; Shigematsu, Shigematsu, Noguchi, & Fujita, ), topical treatment with non‐steroidal anti‐inflammatory drugs (Gatti, Broccardo, Poglio, & Benech, ), cocaine abuse (Alfaya et al, ; Close & Cowan, ), radiation (McCullough, Rye, & Redman, ), alcohol (Brannon et al, ; Dunlap & Barker, ), tobacco smoking (Anneroth & Hansen, ; Brannon et al, ), upper respiratory tract infections, allergy (Brannon et al, ; Samit, Mashberg, & Greene, ), oral intubation (Romagosa et al, ), and surgical procedures (Batsakis & Manning, ). Mandel and co‐workers described a patient with NS resulting from impaired blood supply due to sickle‐cell anemia (Mandel, Kaynar, & DeChiara, ).…”