Secondary malignant neoplasm of brain [C79.31] / Secondary malignant neoplasm of other parts of nervous system [C79.49], Reason for Study: ^Reason: h/o non small cell lung ca with brain met s/p resection and RT History: surveillance The left occipital lobe enhancing mass lesion shows changed its configuration on axial scan but does not show significant size change since prior scan. Previously it was more peripheral enhancement with central non enhancing portion but today's scan shows more enhancing portion central portion of the mass.Surrounding edema of the lesion shows interval decrease since prior scan.Right frontal T2/FLAIR high signal intensity lesion without focal enhancement is again demonstrated without evidence of interval change since prior scan.The ventricles, sulci and cisterns are symmetric and unremarkable. There is no extra-axial fluid collection/hemorrhage, restricted diffusion/acute ischemia. The midline structures and cranial-cervical junction are normal. Normal flow voids are identified in the major intracranial vessels. The paranasal sinuses and mastoid air cells are clear.
1. Interval change of enhancement pattern with decreased surrounding edema but without evidence of significant size change of the left occipital mass lesion since prior scan. 2. Unchanged right frontal lobe lesion since prior scan. 3. No evidence of new abnormal enhancing lesion.4. No acute ischemic or hemorrhagic lesion.