What does "Mass effect on the right greater than left optic chiasm and cisternal segment of the right optic nerve" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.
This phrase is describing a situation where a growth or mass in the brain is pressing more on the right side than the left side of a structure called the optic chiasm. The optic chiasm is the part of the brain where the optic nerves cross over. The mass is also pressing on a part of the right optic nerve that is located in a fluid-filled space in the brain, known as the cisternal segment.
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