Patients with carcinoma of unknown primary origin (CUP) pose a difficult diagnostic challenge, but a missed diagnosis of the primary tumor site is, unfortunately, a frequent occurrence. Musser and colleagues describe a patient with a large para-aortic mass that was initially diagnosed as CUP, but was subsequently identified as metastatic seminoma that showed remarkable spontaneous regression.
- John E. Musser
- Christopher G. Przybycin
- Paul Russo
