Swischuk L E, Fagan C J, Sarwar M
Radiology. 1978 May;127(2):330. doi: 10.1148/127.2.330.
A patient with persistence of the dens as the body of the first cervical vertebra is described. This is an extremely rare anomaly and in this patient was associated with instability of the first cervical vertebra. Embryologic considerations and the clinical implication- of this anomaly are discussed.