PMC6388991_01
Pretreatment chest images.. Note: A 2.6-cm-sized left upper lobe mass (red arrows) was observed in chest X-ray (A) and CT (B).. Abbreviation: CT, computed tomography.
ott-12-1359Fig1.jpg
PMC6388991_01_ott-12-1359Fig1.jpg
f1-ott-12-1359
Chest computed tomography (CT) with contrast enhancement revealed an ~2.6-cm-sized lung mass without any lymph node enlargement (Figure 1).
Pretreatment 18F-fluorodeoxyglucose positron emission tomography/CT images.. Note: There was no lesion with abnormal metabolic activity except for LCNEC (red arrows) in the left upper lobe and a Warthin tumor in the left parotid gland (blue arrow).. Abbreviations: CT, computed tomography; LCNEC, large cell neuroendocrine carcinoma.
ott-12-1359Fig2.jpg
PMC6388991_01_ott-12-1359Fig2.jpg
f2-ott-12-1359
The 4R and 7 station lymph nodes were negative. 18F-fluorodeoxyglucose positron emission tomography-CT showed no abnormal metabolic activity except for left upper lobe lung cancer (maximum standardized uptake value 12.1) and an incidental parotid Warthin tumor (Figure 2).
SBRT plan with volumetric modulated arc technique.. Note: Three arcs were used from 340  to 179  (clockwise and counterclockwise) and from 215  to 180 .. Abbreviation: SBRT, stereotactic body radiation therapy.
ott-12-1359Fig3.jpg
PMC6388991_01_ott-12-1359Fig3.jpg
f3-ott-12-1359
Systems, Palo Alto, CA, USA) with 6 MV photons (Figure 3). SBRT employed a NovalisTx system (Varian Medical Systems and BrainLab, Feldkirchen, Germany).
Posttreatment chest images.. Notes: Chest X-ray (A) and CT (B) 2 months after SBRT revealed a greatly regressed small nodule (red arrows). (C) Chest CT performed 1 year after SBRT evidenced only irregular consolidation around the treated region, indicating a complete tumor response (red arrow) and development of radiation fibrosis.. Abbreviations: CT, computed tomography; SBRT, stereotactic body radiation therapy.
ott-12-1359Fig4.jpg
PMC6388991_01_ott-12-1359Fig4.jpg
f4-ott-12-1359
CT 2 months after SBRT. Chest CT 1 year after SBRT demonstrated only irregular consolidation around the treated region, indicating a complete tumor response along with radiation fibrosis (Figure 4).