What are the likely underlying pathologic conditions that cause short stature, delayed bone age, and decreased growth rates in a child?

Constitutional delay: This is wastebasket term for most late childhood or early adolescents with a normal growth curve, but short stature. When you add delayed bone age and abnormal growth pattern, there are two large groups of children that emerge - hypothyroidism and and a whole vast group of congenitally acquired conditions - suggest you see an endocrinologist to sort this out...