This patient has been taking Propecia for 2 years and not only did the hair growth fill in the crown, but even the miniaturization study showed significant microscopic benefit. This is what I keep talking about in this blog, there is the measurements of science behind what the eye sees.
Miniaturization mapping (captured with video microscope):
Before photo on the left / After photo on the right (2 years on Propecia — no surgery). Click to enlarge: