I would appreciate your opinion about this case: 70 yo white female, obese, admitted to medicine because of 2 cm left supraclavear mass.Asymptomatic. Surgery consulted for excisional biopsy, path report: poorly differentiated epithelial metastasis, most likely adenoca. No other node palpable except 1 cm left axillary (medicine did needle perc biopsy:same pathology).Work up done by medicine:past med history neg, CEA normal, chemistry normal, ENT+ bronchoscopy and biopsies:negative for malignancy,chest x ray normal, neck US:normal thyroid,no masses, abd US:normal except gallstones (asimptomatic), mammogram and breast exam:normal, barium enema:normal except sigmoid diverticulosis, gyn exam + US normal including ovaries: I did gastroscopy yesterday (one already done by other surgeon negative):no evidence of malignancy, did multiple biopsies, waiting for path results.What would you do to find the primary ? CT ? laparoscopy? Any treatment at this point? chemo? What would you tell to pt and family about prognosis?