case_images: PMC10293700_01
case_images: Endoscopic image of a 5 mm-sized polyp of the cecum. (a) Erythematous depressed polyp in the cecum. (b) Narrow-band imaging images of the polyp. (c) Narrow-band imaging magnified image of the polyp.
case_images: DEO2-4-e266-g003.jpg
case_images: PMC10293700_01_DEO2-4-e266-g003.jpg
case_images: deo2266-fig-0001
case_images: As a result, a 5 mm IIa polyp (Figure 1a) was found in the cecum, which had not been identified a year earlier. The findings of narrow-band imaging (Figure 1b,c) were different from these of adenoma.
case_images: Hematoxylin-eosin staining and immunohistochemistry of cold snare polypectomy specimens. (a) Hematoxylin-eosin staining of cold snare polypectomy specimens (x400). (b) Tumor cells positive for thyroid transcription factor-1 immunostaining (x40). (c) Tumor cells positive for Mib-1 immunostaining (x40). (d) Tumor cells positive for synaptophysin immunostaining (x40).
case_images: DEO2-4-e266-g002.jpg
case_images: PMC10293700_01_DEO2-4-e266-g002.jpg
case_images: deo2266-fig-0002
case_images: Hematoxylin and eosin-stained magnified images showed substantial proliferation of basophilic tumor-like cells extending to the mucosal fasciculus (Figure 2a). Immunohistological analysis revealed that the lesion was positive for thyroid transcription factor-1 (TTF-1; Figure 2b), Mib-1(Figure 2c), and synaptophysin (Figure 2d).
case_images: Whole body computed tomography scan. (a) A computed tomography scan shows an ill-defined mass in the left lower lobe (red arrow). (b) Enlargement of the left hilar lymph nodes (red arrow).
case_images: DEO2-4-e266-g001.jpg
case_images: PMC10293700_01_DEO2-4-e266-g001.jpg
case_images: deo2266-fig-0003
case_images: SCLC (Figure 3a,b). Subsequent bronchoscopy led to a biopsy of the left lung mass, of which hematoxylin and eosin staining revealed a bare nucleated dysplastic enhancing tumor resembling a small cell carcinoma (Figure 4a).
case_images: Hematoxylin-eosin-stained and immunohistochemistry specimen for the tumor in the lower lobe of the left lung. (a) Hematoxylin-eosin staining of lung biopsy tissue (x400). (b) Tumor cells positive for thyroid transcription factor-1 immunostaining (x40). (c) Tumor cells positive for Mib-1 immunostaining (x40). (d) Tumor cells positive for synaptophysin immunostaining (x40).
case_images: DEO2-4-e266-g004.jpg
case_images: PMC10293700_01_DEO2-4-e266-g004.jpg
case_images: deo2266-fig-0004
case_images: SCLC (Figure 3a,b). Subsequent bronchoscopy led to a biopsy of the left lung mass, of which hematoxylin and eosin staining revealed a bare nucleated dysplastic enhancing tumor resembling a small cell carcinoma (Figure 4a). TTF-1 (Figure 4b), Mib-1 (Figure 4c), and synaptophysin (Figure 4d).