case_images: PMC9947515_01
case_images: PMC9947515_02
case_images: Chest radiographic image showing a mass lesion in the upper lobe of the left lung (white arrow).
case_images: cureus-0015-00000034122-i01.jpg
case_images: PMC9947515_02_cureus-0015-00000034122-i01.jpg
case_images: FIG1
case_images: An initial chest radiograph revealed a lesion in the upper lobe of the left lung (Figure 1).
case_images: CECT images of the lung showing the tumour in (a) coronal section, (b) sagittal section, and (c) transverse section (red arrows).. CECT: contrast-enhanced computed tomography
case_images: cureus-0015-00000034122-i02.jpg
case_images: PMC9947515_02_cureus-0015-00000034122-i02.jpg
case_images: FIG2
case_images: CECT showed a single mass in the left upper lobe with contrast enhancement and an irregular outline, measuring 3.4x3.5 cm with involvement of the adjacent pleura along the left lateral chest wall (Figure 2).
case_images: Hematoxylin and eosin stain of the bronchial tissue, original magnification x 100
case_images: cureus-0015-00000034122-i03.jpg
case_images: PMC9947515_02_cureus-0015-00000034122-i03.jpg
case_images: FIG3
case_images: The morphology was compatible with that of metastatic rectal adenocarcinomas (Figure 3).
case_images: Immunohistochemical observation of the bronchial tissue. (A) CK20 positive, (B) CK7 negative, (C) TTF-1 negative. CK20: cytokeratin 20; CK7: cytokeratin 7; TTF-1: thyroid transcription factor
case_images: cureus-0015-00000034122-i04.jpg
case_images: PMC9947515_02_cureus-0015-00000034122-i04.jpg
case_images: FIG4
case_images: Immunohistochemistry of the bronchial tissue showed strong positivity for cytokeratin 20 (CK20) and negativity for cytokeratin 7 (CK7) and thyroid transcription factor (TTF-1) (Figure 4).
case_images: PET images of the lung showing the tumour in (a) coronal section, b) sagittal section, and (c) transverse section (yellow arrows). PET: positron emission tomography
case_images: cureus-0015-00000034122-i05.jpg
case_images: PMC9947515_02_cureus-0015-00000034122-i05.jpg
case_images: FIG5
case_images: A strongly fluorodeoxyglucose (FDG) -avid lesion was identified in the inferior part of the apicoposterior segment of the left upper lobe of the lung, measuring 4.92x4.16x4.14 cm (Figure 5).
case_images: PMC9947515_03
case_images: Intraoperative image and the resected specimen of the lung tumour
case_images: cureus-0015-00000034122-i06.jpg
case_images: PMC9947515_03_cureus-0015-00000034122-i06.jpg
case_images: FIG6
case_images: The upper lobe along with the tumour was then removed (Figure 6).