Megalophallus from priapism

No.12754487 ViewReplyOriginalReport
What causes one to get extreme penile enlargement as a consequence of priapism?

https://www.sciencedirect.com/science/article/abs/pii/S0090429500006518
>We report a little known sequela of priapism: painless megalophallus, with significant penile enlargement.

>Megalophallus probably resulted from permanent loss of elasticity of the tunica albuginea due to severe engorgement during the episode of priapism

>This sequela needs to be recognized by physicians because no intervention is necessary and sexual function seems to remain intact.

How can a long lasting erection (priapism) cause the erectile tissue to become permanently enlarged? Surely the pressure from an erection isn't enough to cause the tissue to permanently deform?