*3.5.3 Endometriosis and Thyroid Cancer*

In a large cohort study from the Finish Cancer registry, L. Saavalainen et al. observed an increased risk of thyroid cancer especially of papillary type in women with diagnosed endometriosis [39]. Women do have three times more risk of development of thyroid cancer than men and attribute it to female sex hormones. So hormonal abnormality, mostly estrogen disorder may be a risk factor for thyroid cancer, which is also a factor for endometriosis [40].
