Delayed bone age is associated with which of the following sets of conditions?

Delayed bone age is associated with which of the following sets of conditions?

• A. Hypothyroidism
• B. Growth hormone deficiency
• C. Cushing syndrome
• D. Hypothyroidism, Growth hormone deficiency, and Cushing syndrome

Answer: (D)

Delayed bone age reflects a slowdown in skeletal maturation relative to chronological age, which can occur when several endocrine pathways that drive bone growth are impaired or inhibited. Hypothyroidism reduces overall metabolic activity and slows bone development, leading to a lag in maturation. Growth hormone deficiency directly lowers the hormonal drive for bone growth and maturation, so the bones age more slowly than they should for the child’s age. Cushing syndrome, with excess cortisol, inhibits growth plate activity and bone formation, further delaying skeletal maturation. Because any of these conditions can produce a delay in bone age, the association includes hypothyroidism, growth hormone deficiency, and Cushing syndrome. (Note: hyperthyroidism or early puberty typically causes advanced bone age instead of delayed.)

Delayed bone age reflects a slowdown in skeletal maturation relative to chronological age, which can occur when several endocrine pathways that drive bone growth are impaired or inhibited. Hypothyroidism reduces overall metabolic activity and slows bone development, leading to a lag in maturation. Growth hormone deficiency directly lowers the hormonal drive for bone growth and maturation, so the bones age more slowly than they should for the child’s age. Cushing syndrome, with excess cortisol, inhibits growth plate activity and bone formation, further delaying skeletal maturation. Because any of these conditions can produce a delay in bone age, the association includes hypothyroidism, growth hormone deficiency, and Cushing syndrome. (Note: hyperthyroidism or early puberty typically causes advanced bone age instead of delayed.)