Multiple choice Which of the following is the most common site of subependymal giant cell astrocytomas? Foramen of Monro Temporal horn of the lateral ventricle Trigone of the lateral ventricle Fourth ventricle Reveal answer Fill a bubble to check yourself A Correct answer Explanation Subependymal giant cell astrocytomas (SEGAs) are low-grade brain tumors strongly associated with tuberous sclerosis, and they almost classically arise near the foramen of Monro.