 Various associated syndromes are listed below.Amastia, particularly if it is bilateral, often related to various syndromes, including ectodermal dysplasia and Poland's syndrome, which is characterised by anomalies of underlying mesoderm and abnormal pectoral muscle respectively.Other syndromes, such as FIG4 associated Yunis Varon syndrome (MIM 216340), acro-der-mato-ungual-lacrimal-tooth (ADULT) syndrome, TP63 associated limb mammary syndrome (MIM 603543), TBX3 associated ulnar syndrome (MIM 181450) and KCTD1 associated scalp-ear-nipple syndrome (MIM 181270) have  also been clinically observed.