Endometriosis lesions that compromise the rectum deeper than the inner muscularis layer have more than 40% of the circumference of the rectum affected by the disease - Abrão, Mauricio Simões; Podgaec, Sergio; Dias Junior, João Antonio; Averbach, Marcelo; Silva, Luis Fernando Ferraz; Carvalho, Filomena Marino (The journal of minimally invasive gynecology, 2008)