Poland's syndrome is a congenital and unilateral aplasia of the pectoralis major muscle with other anomalies of the ipsilateral upper extremity. It was first described in 1841 by Alfred Poland. The syndrome is not hereditary and its origin is unknown. The clinical features are various but all patients have absence of at least the sternal head of the pectoralis major muscle.

We present 2 cases in which the only clinical expression was asymmetry of the breasts associated with complete or partial absence of the pectoralis major and minor muscles.