Résumé
Pectoral fascia may act as a protective layer against harmful effects of radiotherapy [fibrosis]. Moreover, dissection of pectoral fascia from its muscle may contribute to much seroma formation. So, this study comes to evaluate the relation between pathological parameters of primary tumour and pectoral fascia1 invasion. Fifty patients submitted to this study where the primary tumour, axillary lymph nodes and pectoral fascia were histopathologically studied. The results showed presence of a good relation between the distance of the primary tumour and pectoral fascia invasion. There was also a good relation between pectoral fascia invasion and axillary lymph nodes infiltration. So, it was advised to remove pectoral fascia when the distance between it and primary tumour is less than 1 cm. Also, it should be removed when there is an axillary lymph node invasion irrespective of their numbers. Otherwise, preservation of pectoral fascia is advised