Trans-vaginal Aspiration of Small Ovarian Endometrioma. Comparison of Two Different Techniques Before ICSI

women candidate for ICSI and having ovarian endometrioma smaller than 5 cm will be randomized to either transvaginal aspiration alone or transvaginal aspiration follwed by injection of small parts of oxidized regenerated cellulose within the cyst cavity during the cycle that preceded the induction cycle of ICSI. Transvaginal aspiration will be done under ultrasonographic guidance with spinal needle insertion inside the cyst cavity followed by aspiration of the chocolate material from the cyst \& then irrigation of the cyst cavity with normal saline solution till complete elimination of the chocolate material. The needle will be withdrawn in women in non-Surgicel group while injection of small pieces of surgicel inside the cyst cavity will be done for women in the surgicel group followed by withdrawal of the needle.