Hi, my name is Antoinette, 53 years old. Diagnosed with Chiari malformation with syrinx. Decompression surgery 6 years ago. 10 days ago I started having problems with my right hand. Loss of grip, lifting, lump in the bend of my elbow, weakness, severe pain, thumb and fingers stiff and sore, shoulder pain, bad headache. I have had a nerve conductive study and waiting for results. I m on blood thinners, so I don t think the lump is a blood clot, I m not sure.