ICAP Flap in Breast Reconstruction: A Complete Guide to Intercostal Artery Perforator Flaps

Intercostal artery perforator (ICAP) flaps have transformed partial breast reconstruction and oncoplastic surgery. Unlike larger free flaps, ICAP flaps are local, perforator-based, and donor-site friendly. This guide explains AICAP and LICAP variants, their indications, and how Prof. Dr. Karaaltın incorporates them — including composite versions with rectus sheath and external intercostal muscle — in complex reconstructive work.

Anatomy at a Glance

• AICAP (Anterior Intercostal Artery Perforator) — perforators arising from the internal mammary system, ideal for medial and inferior breast defects.
• LICAP (Lateral Intercostal Artery Perforator) — perforators from posterior intercostals, ideal for lateral and inferolateral defects.
• Most reliable perforators emerge between the 4th and 7th intercostal spaces.

Indications

• Partial mastectomy defects (oncoplastic reconstruction)
• Lower-pole reconstruction after pillar flap necrosis
• Implant pocket reinforcement and salvage
• Correction of breast asymmetry and tuberous breast deformity
• Selected post-radiation cases

Advantages over TRAM and DIEP

• No microsurgical anastomosis required
• No abdominal muscle sacrifice
• Shorter operative time and faster recovery
• Donor scar hidden in the IMF or lateral chest crease
• Can be combined with implant reconstruction

Composite ICAP Flaps

Dr. Karaaltın frequently elevates ICAP flaps as composite constructs — adding a strip of anterior rectus sheath and external intercostal muscle. This adds:

• Structural strength for the new inframammary fold
• A biological seal over implants
• Vascularised muscle for additional perfusion

Recovery

Hospital stay is 1–2 nights. Drains are removed within a week. Patients return to light activity in 2 weeks and full activity around 6 weeks.

Bottom Line

ICAP flaps offer a modern, elegant middle ground between implant-only and free-flap reconstruction — especially valuable in revision and salvage cases.