Aromatase Excess Syndrome, also known as aexs, is related to hypertrophy of breast and androgen insensitivity, partial. An important gene associated with Aromatase Excess Syndrome is CYP19A1 (Cytochrome P450 Family 19 Subfamily A Member 1), and among its related pathways/superpathways are Signal Transduction and Glucose / Energy Metabolism. Affiliated tissues include breast and bone, and related phenotypes are short stature and gynecomastia