A generalized malignant tumour of unknown primary origin is encountered by every clinical oncologist in their practice, and it is not uncommon that even autopsy fails to reveal the primary tumour. Thus, the tumour is confirmed based on nodal or organ metastases and not even detailed pathological analysis can indicate the organ from which the tumour originated.
In terms of further treatment, however, this information is of major importance. The present case report describes the course and treatment of the disease which was eventually diagnosed as tumour triplicity.