INTRODUCTION
The nasal cartilage system contains two alar cartilages, the nasal septum cartilage, two upper lateral cartilages (also regarded as the extension of the nasal septum cartilage to both sides), and some accessory cartilage components. The nasal cartilage is considered the most demanding element of nasal surgery, especially of rhinoplasty and facial plastic surgery. The surgeon should under-stand the association of the nasal cartilage to the facial morphology, the function of both soft tissues and hard tissues, and nasal function. Patient-specific characteristics may also impact the outcomes of nasal surgery. Nasal surgery involving the nasal cartilage can be roughly divided into cosmetic surgery (no characteristic pathology or deformity of the nose;only performed to improve the appearance), deformity reconstruction (often related to developmental or trauma-related issues, such as cleft lip nose), functional reconstruction (such as repairing a nasal septum deviation or hypertrophy of the turbinate) and related operations such as tumour resection.