Imaging Is The Primary Investigative Modality For Glomus Tumors Of The Head And Neck. The Aim Of This Study Is To Evaluate The Diagnostic Value Of CT, MRI & Angiography In evaluation glomus tumors of the head and neck. The strategies that tumors have evolved for subversion of the host immune system are many; these are generally successful strategies that are seen in a majority of tumor cases and that have profound implications not only for immune-mediated therapies but also for patient survival .The aim of this essay is to study the molecular changes in malignant tumors of head and neck that enable us to understand the events that are occurring at the cellular and subcellular levels and their association with oncogenesis which help to evaluate tumor behavior .Key words :DNA Deoxyribonucleic Acid .APM Antigen Processing MachinerymRNA Messenger Ribonucleic Acid .