Dr. Yousry Megaly, Neuro-Spinal Surgeon at Lifecare Hospital, Musaffah, conducted the successful surgery for posterior fossa decompression on Ms.M , 29 year old Filipino lady to create more space for the cerebellum and to relieve pressure on the spinal cord. She was suffering from Chiari malformations -- a rare condition that occurs in about one in every 1,000 births. Since her high school days, Ms. M was experiencing numbness on her right hand. She consulted the doctors in Philippines, where she was told about the condition and underwent physiotherapy. After she came to Abu Dhabi, she experienced the increase numbness in her right hand and left lower abdomen. She also experienced motor control was not there in her right leg. After consulting few neurologists, Ms. M approached Dr. Yousry Megaly. He told her that, the surgery is the only option left. Dr Yousry and team conducted the successful surgery.  Both patient and family are happy for the outcome of the surgery.  According to Dr Yousry, Chiari malformations (CMs) are structural defects in the cerebellum, the part of the brain that controls balance. When part of the cerebellum is located below the foramen magnum, it is called a Chiari malformation. Chiari malformations may develop when the bony space is smaller than normal, causing the cerebellum and brain stem to be pushed downward into the foramen magnum and into the upper spinal canal. The resulting pressure on the cerebellum and brain stem may affect functions controlled by these areas and block the flow of cerebrospinal fluid (CSF)— the clear liquid that surrounds and cushions the brain and spinal cord—to and from the brain.