**6. Conclusions**

The data available in the literature support a negative association between the presence of an endometrioma and serum AMH level. Moreover, previous surgery for endometrioma is associated with decreased serum AMH level, the risk of the persistence of low AMH being higher in patients with bilateral endometrioma, bigger than 7 cm and with stage IV endometriosis. However, in patients with a wider range of endometriosis without clearly defined fertility status the serum AMH level does not seem to be decreased. In infertile patients with endometriosis available studies suggest lower serum AMH levels, although further research is necessary to clarify this aspect. Moreover, endometriosis seems to negatively impact the oocyte yield, especially in patients with previous surgery for severe endometriosis and endometrioma. The impact of variate types of endometriosis on the oocytes yield is incompletely clarified, the available evidence supporting that endometrioma has a deleterious effect on the ovarian response, with a possible additional negative effect of deep infiltrating endometriosis.
