Which structures are preserved in scanlon's modified radical mastectomy

.* Scanlon's operation: Is a modified Patey's operation wherein instead of removing pectoralis minor, it is incised to approach the affected Level III lymph nodes.* Auchincloss modified radical mastectomy: Here pectoralis minor muscle is left intact and level III lymph nodes are not removed. ref:SRB's manual of surgery,ed 5,pg no 547