The erection sign.
Gillow
J T
JT
D006801:Humans; D008297:Male; D008875:Middle Aged; D010410:Penile Erection / Q000502:physiology*; D013923:Thromboembolism / Q000503:physiopathology*; D014682:Vena Cava, Inferior / Q000503:physiopathology*