Malignant neoplasm of sphenoid sinus

This code signifies a cancerous tumor originating within the sphenoid sinus, one of the paranasal sinuses located deep within the skull, behind the eyes and nose. These neoplasms are typically aggressive and can invade surrounding structures due to their anatomical location.

Apply this code when documentation explicitly states a primary malignant neoplasm of the sphenoid sinus. This diagnosis is typically confirmed through biopsy and imaging studies such as CT or MRI. Use when the pathology report confirms malignancy and the anatomical site is specified as the sphenoid sinus.

• Always confirm the primary site of the malignancy; do not use for metastatic disease to the sphenoid sinus.
• Distinguish from benign neoplasms or neoplasms of other paranasal sinuses (e.g., maxillary, ethmoid, frontal).
• Ensure the pathology report or operative notes clearly identify the sphenoid sinus as the origin.