Scalp Tissue Expansion Above a Custom-Made Hydroxyapatite Cranial Implant to Correct Sequelar Alopecia on a Transposition Flap.
BACKGROUND
Resection of cranial tumors involving both bone and scalp tissue may require the recruitment of soft tissue using a flap above the bone reconstruction. When a transposition flap has been chosen, the alopecia zone on the donor site may be difficult to treat afterward. Scalp expansion is the gold standard in these situations, but this has never been described above cranial implants. We report the first case of a patient who underwent a scalp tissue expansion above a custom-made hydroxyapatite cranial implant to correct sequelar alopecia.


CASE DESCRIPTION
A 30-year-old man presented with a dermatofibrosarcoma of the scalp with bone invasion. A cranioplasty with a custom-made hydroxyapatite implant and a transposition flap were performed. Although healing was achieved, the donor site of the transposition flap left a 9 × 13 cm sequelar alopecia area on the vertex. To correct it, a rectangular 340-cm3 expander was partially placed above the cranial implant and under the transposition flap. A second 120-cm3 expander was put on the contralateral temporal region. The expansion was successful. No expander infection, cranial implant displacement, or fracture on imaging performed during the follow-up period was detected. The alopecia zone was entirely excised. The patient was very satisfied with the cosmetic result.


CONCLUSIONS
Tissue expansion above hydroxyapatite implants may be of concern to the physician because of the risk of infection and rupture of the cranial implant. With this clinical case, we emphasize some precautions to prevent these issues.
['Carloni|Raphael|R|', 'Herlin|Christian|C|', 'Chaput|Benoit|B|', 'De Runz|Antoine|A|', 'Watier|E|E|', 'Bertheuil|Nicolas|N|']
D000328:Adult D000505:Alopecia D003399:Craniotomy D018223:Dermatofibrosarcoma D017886:Durapatite D006258:Head and Neck Neoplasms D006801:Humans D008297:Male D009361:Neoplasm Invasiveness D019736:Prostheses and Implants D019919:Prosthesis Implantation D019651:Reconstructive Surgical Procedures D012535:Scalp D012878:Skin Neoplasms D016038:Skin Transplantation D012886:Skull D012888:Skull Neoplasms D013524:Surgical Flaps D015626:Tissue Expansion
Tissue expansion Alopecia Transposition flap Cranioplasty Calvarial reconstruction