Oligodendrogliomas are tumors thought to arise from oligodendrocytes, which are cells that insulate neurons in the brain and spinal cord thereby facilitating efficient transmission of nerve impulses.
When viewed under the microscope, the cells of oligodendrogliomas resemble fried eggs in appearance – fried egg-like cells.
Vesper J et al: Retrospective analysis of treatment outcome in 315 patients with oligodendroglial brain tumors. BMC Neurol, 2009 16(9):33. Link
Fried egg-like cells