Letrozole and desogestrel-only contraceptive pill for the treatment of stage IV endometriosis Posted on 2 Gennaio 200717 Febbraio 2020 by admin Remorgida V, Abbamonte LH, Ragni N, Fulcheri E, Ferrero S. Letrozole and desogestrel-only contraceptive pill for the treatment of stage IV endometriosis. Aust N Z J Obstet Gynaecol 2007;47:222-225.