A benign or malignant neoplasm that affects the ethmoid sinus. Representative examples of benign neoplasms include Schneiderian papilloma and salivary gland-type adenoma. Representative examples of malignant neoplasms include carcinoma and lymphoma. The disease is ethmoidal sinus neoplasm (MONDO_0001764). Also known as: ethmoid sinus neoplasm, ethmoid sinus neoplasm (disease), ethmoid sinus tumor, ethmoid sinus tumour, ethmoidal sinus tumor, ethmoidal sinus tumour, neoplasm of ethmoid sinus, neoplasm of ethmoidal sinus.