Inclusion Criteria:  Patient suspected to have endometrioma or hemorrhagic ovarian cysts.  Exclusion Criteria:  Simple cysts which were defined as a sonolucent thin-walled (<3 mm thick) cyst larger than 3 cm in diameter without septations or papillary projections [12]. Hemorrhagic cysts containing septations or mural nodules with detectable flow on Doppler ultrasonography