One-stage immediate breast reconstruction may be done at the same time as mastectomy. After the general surgeon removes the breast tissue, a plastic surgeon places a breast implant.

Two-stage reconstruction or two-stage delayed reconstruction is the type most often done if implants are used.An implanted tissue expander, which is like a balloon, is put under the skin and chest muscle. Through a tiny valve under the skin, the surgeon injects a salt-water solution at regular intervals to fill the expander over a period of about 4 to 6 months. After the skin over the breast area has stretched enough, a second surgery will remove the expander and put in the permanent implant.

The two-stage reconstruction is sometimes called delayed-immediate reconstruction because it allows time for other treatment options. If the surgical biopsies show that radiation is needed, the next steps may be delayed until after radiation treatment is complete. If radiation is not needed, the surgeon can start right away with the tissue expander and second surgery.

if you  plan  RT for your patient  you have two chance

1- tissue expander ---RT--- breast implant 

2- flap procedures; A pedicle flap or a free flap ( TRAM,LD )

Immediate reconstruction is straight after a mastectomy or skin sparing mastectomy and it could be

Standard work up will often provide information about need for Post op Adjuvant RT. Some carry out a stand alone SNB in node negative cases (clinical negative, Ultrasound negative axilla) to guide need for RT if the breast tumour parameters--are favourable.

There are some papers about impact of RT on implant based reconstruction and autologous tissue based reconstruction.

The final option is delayed breast reconstruction after RT usually autologous options mentioned above.

Immediate reconstruction could potentially also involve natural tissues with DIEP flap or TRAM flap. It certainly is an option for cancers that are not close to the chest wall and will not need radiation. As regards implant only, the answers given by the other doctors explain it well with a one stage implant only versus a two stage tissue expander first followed by implant later.

by the concept of immediate breast reconstruction which had its indications....it is either implant only which is not favoured nowdays and expander-implant technique which is sometimes known as delayed.immediate reconstruction and itis favoured for the patients that are querry to recieve radiotherapy

Immediate reconstruction refers to a reconstructive procedure that takes place at the same time as mastectomy. This does not preclude further planned reconstructive procedures.

One-stage refers to reconstruction with one planned procedure.

Implant only refers to reconstruction using an implant (or expander or expandable implant) without a flap (tissue transfer).