Hemorrhage danger from feet over head? - Yoga Plow?

[valhalla]

Hi,
Are there any dangers or concerns relative to blood vessels and possible hemorrhaging, when having your legs above your head for extended periods of time? For example with the Yoga plow position, standing on your head, inversion tables etc. Would a cavernous malformation or other blood vessel issues, be more susceptible to dangers from this kind of inversion? Thank you!

VH