The iliolumbar vein is the vena comitans of the iliolumbar artery.
The obturator nerve crosses superficial to it.
A single vein is found more commonly than a double vein.
It drains vertebral segments four and five.
It is closely related to the ascending lumbar vein.
posterior: iliolumbar · superior gluteal · lateral sacral
noco/syva/cong/lyvd/tumr, sysi/epon, injr
proc, drug (C2s+n/3/4/5/7/8/9)