AMH and cyst: Recently, a study of 193 patients who underwent laparoscopic cystectomy for endometrioma demonstrated that postoperative AMH levels significantly decreased after surgery irrespective of age (≤38 years, P < 0.001; >38 years, P < 0.001), cyst size (>3 cm, P = 0.018; ≤3 cm, P = 0.022), and laterality (unilateral, P < 0.001; bilateral, P < 0.001) [33].