X-ray of a young man shows hetrotopic calcification around bilateral knee joints. Next investigation would be
a) Serum phosphate
b) Serum calcium
c) Serum PTH
d) Serum Alkaline phosphatase
Correct answer : a) Serum phosphate
7 year old child presents with a lesion in upper tibia. X-ray shows radiolucent area with Codman's triangle and Sunray...