Hello, Welcome to Health Care Magic. I understand your concern. The condition you are describing, is called neuro encephalomalacia, which is a condition characterized by localized softening of brain tissues due to inflammation or hemorrhage. The softening may occur in a specific part of the brain or may be more widespread. The treatment for this disease mainly consists of detecting the underlying cause behind the change in brain consistency and dealing with it properly. In extremely severe cases, damaged brain substance may be removed by surgery. However, the brain consistency undergoes a considerable change due to the removal of the softened brain material. -Regarding to your questions, the space that was previously occupied by brain mass, now it is filled with cerebrospinal fluid. Cerebrospinal fluid(CSF) is normally produced by your brain, and has three main functions: protects brain and spinal cord from trauma. CSF supplies nutrients to nervous system tissue and removes waste products from cerebral metabolism -As with any surgical procedure, complications may occur. Brain surgery risk is tied to the specific location in the brain that the operation will affect. For example, if the area of the brain that controls speech is operated on, then speech may be affected. I mean the side effects depend on the part of the brain which is resected. Hope I answered to your question. Take care, Dr. Ina Zaimi