Aortic graft used to rebuild windpipe in thyroid cancer surgery

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: Study inclusion criteria will be approved by a multidisciplinary tumor board (local or national, e.g., TUTHYREF, if necessary) and will include the following: * patients with thyroid cancer involving the trachea and/or cricoid cartilage that is not amenable to simple resection-anastomosis, regardless of prior treatment status; * patients with any histological type of thyroid cancer, excluding the undifferentiated/anaplastic type; * patients deemed eligible for surgical resection based on standard preoperative assessment; * lesions considered unresectable via standard procedures; * women using effective contraception throughout the study duration, in accordance with CTCG recommendations. Exclusion Criteria: * age under 18 years; * patients unable to provide consent; * patients not covered by the French Social Security system; * patients with undifferentiated/anaplastic thyroid cancer; * patients for whom standard preoperative assessment precludes surgical resection (e.g., severe malnutrition, limiting cardiovascular disease, limiting respiratory disease with DLCO \< 35% or VO2max \< 10 ml/min/kg); * patients with \*de novo\* thyroid cancer and minimal tracheal invasion suitable for simple resection-anastomosis; * patients with \*RET\* mutations; * pregnant or breastfeeding women; * patients participating in another interventional study; * patients under legal guardianship or trusteeship. Note that for patients with metastatic disease, the decision regarding inclusion or exclusion will be made on a case-by-case basis during the multidisciplinary team (MDT) meeting; contraindications to standardized tracheal resection and primary anastomosis reconstruction will be determined by the MDT; and all histological types-including medullary carcinoma-will be included, with the exception of undifferentiated/anaplastic types, to ensure a homogeneous group regarding local invasion and prognosis. Note also that minimal invasion (\<2 cm)-in the absence of repeat surgery, and regardless of the presence or absence of recurrent laryngeal nerve paralysis-requires resection-anastomosis.