Endometriomas are more frequent on the left side

Abstract

Our results confirm a left lateral predisposition of endometrioma. This predisposition may be caused by the presence of the sigmoid colon in the left side of the pelvis, which decreases peritoneal fluid movement. Our findings may support the transplantation theory of the origin for endometriosis.

Right endometrioma is related with more extensive obliteration of the Douglas pouch

“…On the other hand, our results showing the left lateral predisposition of ovarian endometriotic cyst are in agreement with previous reports [8][9][10]. However, these studies did not investigate whether endometrioma side is related with endometriosis severity.…”

“…However, these studies did not investigate whether endometrioma side is related with endometriosis severity. Left lateral predisposition of endometriosis and endometriomas could be explained by anatomical and hormonal factors [8][9][10]. According to Vercellini et al, the presence of sigmoid colon on the left side may delay elimination of the regurgitated endometrial cells coming through the fallopian tubes during menstruation.…”

“…Several previous studies revealed that endometriosis and endometrioma mostly aVect left lateral side of the pelvis [8][9][10]. The objective of this study is to investigate that endometrioma is an asymmetric disease with left lateral predisposition as compared to other benign ovarian cyst and also whether endometrioma side is related with endometriosis severity.…”

Can specific pain symptoms help in the diagnosis of endometriosis? A cohort study of women with chronic pelvic pain

“…We did, however, find an increased occurrence of ovarian endometrioma on the left side, compared with the right side, confirming the findings of others (18)(19)(20). Based on Sampson's theory of retrograde menstruation (3), it has recently been postulated that the deposition of viable endometrial cells, shed through the fimbrial ends of the uterine tubes, occurs equally on both sides.…”

Histopathological pattern and lateral distribution of benign ovarian cysts

“…In contrast a study carried out in Scandinavia showed that left ovarian involvement (62.8%) was more frequent than right (Sznurkowski et al, 2008) In Asians Physiological cysts were 47 (28.1%). Simple follicular cysts were 17(10.2%) and corpus luteal cysts 30(18%).…”