Test on Midface Reconstruction: Defects and Techniques

Question 1: Small volume midface defects with large surface area requirements are typically reconstructed with a rectus abdominis myocutaneous flap.

A. Ano

B. Ne

Explanation: Small volume defects with large surface area requirements, specifically Type I limited maxillectomy defects, typically use a radial forearm free flap for reconstruction, not a rectus abdominis myocutaneous flap.

Question 2: According to the provided study materials, which reconstructive approach is specifically indicated for a Type IV orbitomaxillectomy defect?

A. Reconstruction with a radial forearm fasciocutaneous free flap.

B. The primary goal is to reconstruct the orbital floor while preserving orbital contents.

C. A rectus abdominis flap with one or more skin islands for external skin and/or nasal lining.

D. It involves the resection of the palate along with the orbital contents.

Explanation: For Type IV defects, the study materials state that the rectus abdominis flap is the flap of choice, with one or more skin islands used for external skin and/or nasal lining. Type IV defects involve loss of orbital contents, not preservation, and the palate is typically left intact, not resected. The radial forearm fasciocutaneous free flap is recommended for Type IIA defects, not Type IV.

Question 3: Is a bone graft typically required to reconstruct the orbital floor in Type IIIA maxillectomy defects?

A. Ano

B. Ne

Explanation: For Type IIIA defects, a bone graft is needed to reconstruct the orbital floor. Commonly used bone grafts include split calvarium, iliac crest, or split ribs, which are used for bony support to reconstruct both the maxillary prominence and the orbital floor.

Question 4: Reconstruction of a Type IIIA maxillectomy defect aims to restore the nasal lining as one of its primary goals.

A. Ano

B. Ne

Explanation: The reconstructive goals for a Type IIIA defect are to support the globe, obliterate any communication between the orbit and nasopharynx, and reconstruct the palatal surface. Restoring the nasal lining is not listed as one of these primary goals.

Question 5: Which of the following statements accurately describes the use and benefits of a radial forearm osteocutaneous 'sandwich' flap for Type IIB maxillectomy defects?

A. It is primarily used to reconstruct the orbital floor and support the globe.

B. It provides bone for structural support, skin lining for the neopalate and nasal floor, and can be shaped to recreate the maxillary alveolar arch.

C. It is typically chosen when the defect involves resection of all six walls of the maxilla, including orbital contents.

D. A prosthesis is generally considered an adequate alternative for structural support in these defects.

Explanation: For Type IIB defects, an osteocutaneous free flap like the radial forearm osteocutaneous 'sandwich' flap is needed because these defects require bone for structural support and skin lining for the neopalate and nasal floor. The bone segment can be shaped to recreate the maxillary alveolar arch and support the upper lip, and the skin replaces the lining of the palate and nose. A prosthesis is inadequate for these defects, and the flap is for Type IIB, not Type IIIA or Type IIIB.