[Observations on cancer metastasis from an unknown primary location]

Following a short introduction in which the criteria used to classify patients suffering from cancer metastasis from an occult primary location are defined, the paper reports two cases of this type: an omental metastasis occluding the upper colon and an inguinal lymph node metastasis. Referring to the international literature, the Authors then analyse the reasons for the inability to recognise the neoplasm, its incidence, patients survival, the most appropriate diagnostic course and possible treatment of these cases. In conclusion, over and above the definition of a truly autonomous nosological status of metastasis of unknown origin, it is important to follow a correct diagnostic procedure in order to establish the most appropriate form of therapy.