Endometrioma Sclerotherapy and Ovarian Preservation

Inclusion Criteria: * Female (XX genotype, assigned female at birth) * Age 18-40 * Finding of suspected uni- or bi-lateral ovarian endometrioma(ta) of ≥ 2cm on TVUSS and/or pelvic MRI scan (TVUSS, a uni- or multi-locular ovarian cystic lesion with low level echoes and diffuse homogeneous ground glass appearance; MRI any of, ovarian lesion hyperintense T1 without loss of signal on T1 fat-suppressed images, hypointense T2 exhibiting shading sign and/or T2 dark spot sign, variable restricted diffusion on DWI) * Appropriate to be listed for laparoscopic excision of endometrioma (Endometrioma ≥2cm, pain symptoms attributable to endometriosis where medical management is unsuccessful or unacceptable to the patient, to facilitate ART) Exclusion Criteria: * Postmenopausal status * Suspicion of malignancy * Unable to undergo TVUSS * Declines to take part in the study * Unable to understand verbal or written information in English * Lack of capacity to consent at the point of recruitment * Known safeguarding issues