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On the non-contrast study, there is a dilated tubular structure extending from the region of the left adnexa and terminating at the presumed site of the left renal vein, another tubular structure seen starting at the level of the left adrenal gland and again terminating at the level of the left renal vein.
On the post-contrast study, there is a retro-aortic left renal vein with subsequent dilatation of its proximal portion.
The tubular structure that extends from the pelvis is a thrombosed recanalized left ovarian vein. The vessel that extends from the left adrenal gland is the left adrenal vein.
Note the pelvic varicosities.