A rare case with basilar invagination anomaly in craniocervical junction: role of CT & MRI

In this paper we will present a 49 years old Iranian man with a totally different craniocervical junction. The case has referred with severe headache, as his chief complaint, to the emergency ward of Hazrat Rasoul hospital (Tehran, Iran) in March 2012. After admission and primary examinations, in order to find the cause of headache, the patient was referred to imaging department requesting brain CT scan. While, the case wasn’t aware of his unusual cervical anatomy; after complementary examinations, i.e. MRI, we found an abnormal form of cervical spine junction with cranium and completely different craniocervical junction and chronic altered power ratio while the patient had no pathological symptoms.