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

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.