My Son Was Diagnosed With Chiari Malformation Type 2 When

My son was diagnosed with chiari malformation type 2 when he was 3 years old. He went though the decompression surgery. He is now 7 years old and his Dr says everything looks good. We are starting to notice that he is starting to fall behind in school. he has trouble verbalizing his thoughts and he is having trouble with his timed math work. Is there a link between chiari 2 and learning disabilities?