H/o neuroblastoma. Examination demonstrates an extraaxial, necrotic, enhancing mass occupying at the site of the right sigmoid sinus of the right cerebellopontine angle. There is bony destruction of the right mastoid air cells. The external and internal auditory canals and middle cavity appear intact. No adjacent parenchymal edema is detected.Though technically challenging, a comparison of the current CT with prior MRI leads to an impression of increase in size of the mass. The cerebral and cerebellar hemispheres are normal in attenuation and morphology. There is no intracranial mass, hemorrhage, edema, midline shift or abnormal extraaxial fluid collection. The ventricles are normal in volume. The visualized paranasal sinuses and left mastoid air cells are normal pneumatized.
Given clinical history provided, findings are compatible with a neuroblastoma at the right cerebellopontine angle with involvement of the right sigmoid sinus and mastoid. 