Hi, Thanks for writing in to us. Bilaterally opacified mastoid air cells mean that the air containing spaces within the petrous temporal bones which are located behind the ear are showing some fluid collections. This can happen when there is an ear infection which causes seepage of fluids into these mastoid ear cells. It requires an examination by the ENT specialist. The details of your tumor surgery would be required to know if the autonomic dysfunction disorder, gait disorder, memory loss, tremors are due to after effects of the surgery. Periventricular white matter is the white matter areas in the brain which is found next to the ventricles or fluid containing spaces. This can mean that there is seepage of the cerebrospinal fluid in to the white matter and if you are an elderly person then this is acceptable. It is a variant of the degenerative changes in the elderly people.