We have seen a case of oligodendroglioma arising in the left frontal lobe of 64-year-old woman. She had complained of longstanding headache with occasional seizures and episodic dysarthrias for six years before admission. On admission there were drowsy mentality and bilateral papilledema of 3 diopters without other neurological abnormality. The tumor was showed as a calcified mass of an egg size in the left frontal lobe even on the plain skull X-ray films. The tumor was totally removed by surgery and measured 4(5(4cm. On microscopic examination it was a typical oligodendroglioma. The patient was discharged in good condition on the twelfth postoperative day. Many authors reported that the incidence of oligodendrogliomas in all glioma group was relatively rare. In Korea there was no clinical report of oligodendroglioma except only two cases reported by Dr. Lee et al. in 1966. So we present this case, though it was typical and classical in pathological nature and clinical process.