Rapid response to radiotherapy in unresectable tracheal adenoid cystic carcinoma: A case report

Figure 1 Imaging of the case. A and B: Chest computed tomography pre-treatment revealed a soft tissue mass surrounding the inner surface of the upper trachea; C and D: Chest computed tomography after 60 Gy indicated dramatic regression of the tumor.

Figure 2 Bronchoscopic findings. A: Pre-treatment revealed that a large polypoid intra-luminal mass, with its surface presenting rich vascular networks and nodular protrusions; B: After receiving 40 Gy, bronchoscopy indicated that the previous large polypoid intra-luminal mass was significantly eliminated.

Figure 3 Dose distribution of the first and second treatment plan using intensity-modulated radiotherapy. A: The first radiotherapy plan (30 × 2 Gy) with an irradiated high dose zone for CTV_low, surrounded by a red line; B: The second radiotherapy plan, where CTV_high (red line) received an additional 10 Gy in 5 fractions and the GTV (green line) received another 6 Gy in 3 fractions. IMRT: Intensity modulated radiation therapy; CTV: Clinical target volume; GTV: Gross tumor volume.