Malignant neoplasm of ethmoidal sinus

This code signifies the presence of a cancerous tumor originating in the ethmoidal sinus. This is a type of paranasal sinus malignancy, specifically affecting the air-filled cavities located between the eyes and behind the nose. The tumor is characterized by uncontrolled cell growth with the potential for local invasion and metastasis.

Use this code when documentation confirms a primary malignant neoplasm of the ethmoidal sinus. This diagnosis is typically established through biopsy and histopathological examination. Clinical scenarios include initial diagnosis, staging, and treatment planning for ethmoidal sinus carcinoma.

• Ensure documentation specifies "malignant" and clearly identifies the ethmoidal sinus as the primary site.
• Do not use for benign tumors or secondary metastatic lesions to the ethmoidal sinus.
• Consider additional codes for laterality (if specified) and any associated symptoms or complications.