Kevin E Snyder, M.D.

March 24, 2004

Discussion

Central neurocytomas tend to occur in younger patients, with an average age of presentation of 31. They tend to behave non-aggressively, with a long expected survival rate after diagnosis. These lesions may be diagnosed either by CT or MRI. Typical location for a central neurocytoma is within a lateral ventricle. Preferentially, these tumors tend to involve a broad base of attachment with the lateral ventricle or with the septum pellucidum, as in this case. They also tend to occur in the region of the foramen or Monro, with almost all presenting cases demonstrating resultant hydrocephalus. CT imaging characteristics include small intra-tumor cysts, calcifications and a slightly hyperdense attenuation pattern. MRI demonstrates a heterogeneous signal intensity with mild, heterogeneous enhancement. Foci of markedly low signal intensity may be present, which can represent either calcifications (as in this case) or vascular flow voids.

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