Cervical endometriosis associated with malignant pleural mesothelioma mimicking cervical cancer—Occam’s razor or the “third man”

Conclusion(s) Usually, the simplest diagnosis explaining a complex of symptoms and clinical and diagnostic findings is the one most likely to be correct. This is an application of Occam’s razor to medicine. Our case illustrates that occasionally the simplest and therefore most probable diagnosis can be wrong, and on these occasions one should consider a “third man.”