case_images: PMC6388991_01
case_images: 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.
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case_images: PMC6388991_01_ott-12-1359Fig1.jpg
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case_images: Chest computed tomography (CT) with contrast enhancement revealed an ~2.6-cm-sized lung mass without any lymph node enlargement (Figure 1).
case_images: 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.
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case_images: PMC6388991_01_ott-12-1359Fig2.jpg
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case_images: 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).
case_images: 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.
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case_images: PMC6388991_01_ott-12-1359Fig3.jpg
case_images: f3-ott-12-1359
case_images: Systems, Palo Alto, CA, USA) with 6 MV photons (Figure 3). SBRT employed a NovalisTx system (Varian Medical Systems and BrainLab, Feldkirchen, Germany).
case_images: 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.
case_images: ott-12-1359Fig4.jpg
case_images: PMC6388991_01_ott-12-1359Fig4.jpg
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case_images: 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).