The diagnosis of cancer of<unk>  primary origin is made when the following diagnostic criteria are met: tissue biopsy indicating malignancy and all known primary origins of cancer are ruled out.
Cancer of unknown primary origin diagnostic study of choice
Appendix cancer diagnostic study of choice
Stomach cancer Diagnostic study of choice
Appendix cancer echocardiography and ultrasound
Cancer of unknown primary origin other diagnostic studies
Appendix cancer other diagnostic studies
Stomach cancer other diagnostic studies
Stomach cancer echocardiography or ultrasound