<prompt> Best investigation to establish the diagnosis of endometriosis is:LaparoscopyUSGX-ray pelvisCT Scan  <response>: Diagnostic laparoscopy is the gold standard for diagnosing endometriosis.Typical lesion: Powder burnGun shot lesions black, dark brown, or bluish cysts with old hemorrhage surrounded by variable degree of fibrosisOther non-typical findings could be: Red implants Serous or clear vesicles White plaquesscarring Yellowish brown discoloration of peritoneum Sub ovarian adhesions Presence of defects in the peritoneum usually scarring overlying implants is called as Allen masters syndrome. Histological confirmation of laparoscopic impression is essential for diagnosis of endometriosis. 