My patient has known history of diabetes mellitus from 8years and knee problem from 6 years. Now there is report of cervical lymph node tumor on the left side of neck, whose biopsy report diagnosed as "Metastatic carcinoma based on the immunohistochemical profile, upper gastrointestinal tract and lungs should be evaluated as the primary site of origin of the tumor". Kindly suggest me what should we do in the next, while no actual location of carcinoma is yet identified.