Left septal sinus osteoma is not nasal cancer. Clinically, there are mainly the following analyses: First, the formation of septal sinus osteoma is mainly related to embryonic cartilage residue, trauma or local chronic inflammatory stimulation of septal sinus, etc. Septal sinus osteoma is a very common benign tumor, not a manifestation of cancer. Sieve sinus osteoma may mainly cause local obstruction, such as affecting the smooth drainage of sieve sinus, leading to frontal sinusitis, possible headache, further increase of osteoma may compress the optic nerve, etc. Generally, sieve sinus osteoma will not grow after adult. Secondly, nasal cancer is a malignant tumor mainly found in the lateral wall of the nasal cavity, mainly manifested by nasal bleeding, nasal blockage and nasal swelling, and smooth new organisms inside the nasal cavity can be seen during examination, and a clear diagnosis can be made through pathological biopsy.