24/7 calf pain? Hmm. If you are still growing, then there's the outside chance of the muscle not stretching fast enough to match bone growth; If you are an avid runner or participate in other high impact activities then a stress fracture may not have been picked up by the Wikipedia reference-linkMRI - I assume they were checking for DVTs. Another possibility, and I almost hate to mention it b/c it is seen by some to carry a psychological component to it, but RSD or Complex Regional Pain Syndr. (i really doubt you have this); Another possibility is a lumbar nerve irritation; I have seen calf pain that is intense but you can't really press on it, or find it locally, and it turns out that it is referred from the lowback; Good luck, keep researching.