I was comparing 2 of my mris. 1 from years ago states that my chiari malformation was low lying and 1cm below a line drawn between the basion and opisthion.My most recent mri states the tonsils are very low lying and extend to the superior margin of the c1 elements. Since the 2 mris were done by different measuring standards, I cannot tell if the condition has progressed. Can you tell me if the 2 mri shows progression? Thank you.
Hi, Thanks for writing in. Chiari malformation is a congenital condition affecting the cerebellar tonsils and upper portion of spinal cord. In the first MRI there is a technical comment saying that the cerebellar tonsils are below 1 cm to a line Chat Doctor.  In the second report there is mention of extension till the level of C 1. In such a situation, it will be better to see the images once again and