Abnormal Formation, Course and Termination of Right Ovarian Vein– A Rare Anatomical Observation
The knowledge of anomalies of ovarian veins is important for the surgeons to protect these veins during surgery. The right ovary is drained by the pampiniform plexus of veins which form a single vein in the suspensory ligament of ovary and it passes retroperitoneally along the psoas major muscle in the posterior abdominal wall to drain into the inferior vena cava. There is a report of MRI findings indicating the termination of right gonadal vein into right renal vein in about 9% of the cases. However there are no reports on gross anatomical findings of variation of right ovarian vein. During a routine dissection for undergraduate students at Melaka Manipal Medical College (Manipal Campus), we encountered a rare case of abnormal formation, course and drainage of right ovarian vein in an approximately 60-year- old female cadaver. In this case, the variant right ovarian vein originated from the pampiniform plexus of veins. As it ascended, it received two more tributaries from the right ovary. One of the proximal veins joined it on its right side at the pelvic brim. The distal tributary joined the main right ovarian vein at the level of L4 vertebra on its left side. The right ovarian vein then ascended almost parallel to the inferior vena cava and anterior to the right ureter to terminate into the right renal vein making 90 º angles with it. Knowing the anatomical variations of the drainage pattern of ovarian veins may help the gynecologist to avoid potential complications during routine laparoscopic procedures. The profound knowledge of such vascular variation is of great clinical importance for the urosurgeons during surgeries involving the kidney and ureter as they can damage the vessels which can lead to intra-abdominal hemorrhage.
Key words- Right ovarian vein, pampiniform plexus, laparoscopic surgeries