Magnetic resonance imaging (MRI) gives an accurate analysis of Meckel'
s cave variability. Images were acquired in 50 patients with several s
ections for anatomical comparison. Using several sections, MRI is a su
itable method for better analysis of the trigeminal cistern. The most
frequent findings are symetrical trigeminal cisterns. Expansion of Mec
kel's cave or its disappearance has pathological significance.