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Esthesioneuroblastoma is a rare cancer that starts in the nervous system cells responsible for smell. The most common staging system for esthesioneuroblastoma is the Kadish staging system. Stages are given as the letters A, B, C and D.
The tumour is in the nasal cavity.
The tumour has grown into the paranasal sinuses.
The tumour has grown outside of the paranasal sinuses.
The tumour has spread to a distant part of the body (called a distant metastasis).
Esthesioneuroblastoma that comes back after it has been treated is called recurrent esthesioneuroblastoma.