ATYPICAL OLFACTORY NEUROBLASTOMA
Olfactory Neuroblastoma is an uncommon malignant neoplasm of the superior nasal cavity, originating from the olfactory mucosa. Olfactory Neuroblastoma may infiltrate the sinuses, the orbit and the cranium. Usually no specific radiological features indicate the diagnosis, they usually present as a soft tissue mass in the superior olfactory recess involving the anterior and middle ethmoid air-cells on one side and extending through the cribriform plate into the anterior cranial fossa. Contrast enhancement is often marked in both CT and MRI studies. The extent of tumor in the paranasal sinuses and anterior cranial fossa is best assessed with MRI after intravenous gadolinium, and this is considered as the most accurate method for assessing preoperative resectability.
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