John is a 26-year-old man who begins to notice a progressive enlargement of feet, hands, cranium, nose, and lower jaw bone. his doctor recommends irradiation of the pituitary gland. what is the most likely diagnosis, and what caused this condition?

Acromegaly is a condition, in which the body of the fully grown adults, mostly the middle aged ones continues to grow. In this condition, the size of the feet, bones, hands, cranium and the body increase abnormally.  

This condition is mainly caused by the overproduction of the growth hormone from the pituitary gland. This overproduction of growth hormone can be due to the presence of the non cancerous tumor in pituitary. That is why, his doctor suggests irradiation of pituitary.  

layer 3 is younger than layer 6.