I did not know that today was #Rarediseaseday . Last year I had an #MRI done on my brain for something else. Then I find out that I was born with an #underdeveloped #CorpusCallosum. Or #AgenesisoftheCorpusCallosum. The Corpus Callosum is the fibrous part of the brain that connects and communicates between the two #hemispheres. This is a rare disease that can cause developmental delays, learning disabilities, and eating difficulties to name a few.