Micromastia, or breast hypoplasia, is a medical term describing the postpubertal underdevelopment of a woman's breast tissue.^[1] Just as it is impossible to define 'normal' breast size, there is no objective definition of micromastia. Breast development is commonly asymmetric and one or both breasts may be small. This condition may be a congenital defect associated with underlying abnormalities of the pectoral muscle (as in Poland's syndrome^[2]), related to trauma (typically surgery or radiotherapy) or it may be a more subjective aesthetic description.