Table 2. Etiology of tall stature.

Normal Variant	Familial Tall Stature Constitutional Advance of Growth
Endocrine or secondary growth disorders	Obesity Aromatase deficiency Estrogen receptor α deficiency Precocious puberty GH/IGF-1 excess Thyrotoxicosis McCune-Albright Syndrome
Syndrome
Proportionate	Sotos syndrome / Sotos-like syndrome
	Tatton-Brown-Rahman Syndrome
	Weaver syndrome / Weaver-like syndrome
	Fragile X syndrome
	Susceptibility to Autism 18
	Simpson-Golabi-Behmel syndrome
Disproportionate	Marfan syndrome
	Homocystinuria
	Klinefelter syndrome
	Beckwith-Wiedemann syndrome
	Triple X (XXX) syndrome
	Proteus syndrome