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case_images: Computed tomography of the lung. An intrabronchial space-occupying lesion in the right middle lung lobe was observed.
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case_images: However, a chest computed tomography (CT) scan revealed a space-occupying lesion in the bronchus of the right middle lung lobe (Figure 1).
case_images: Bronchoscopic findings. A bulging neoplasm with small nodular changes on the surface and localized bronchial stenosis was seen in the bronchus of the right middle lung lobe.
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case_images: These neoplasms exhibited small nodular changes on their surface and were associated with localized bronchial stenosis (Figure 2).
case_images: Hematoxylin-eosin staining and immunohistochemistry of bronchial tissue biopsy. The pathological examination revealed positive staining for pan-cytokeratin, wild-type p53, CD56, thyroid transcription factor 1, synaptophysin, and chromogranin A as well as Ki67 positivity of 90%. Negative staining was observed for p63, p40, and leukocyte common antigen.
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case_images: Negative staining was observed for p63, p40, and leukocyte common antigen (Figure 3).
case_images: Computed tomography of the abdomen. Bowel dilatation with no evidence of mechanical obstruction was observed.
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case_images: CT imaging revealed conspicuous bowel dilatation with no evidence of mechanical obstruction (Figure 4).
case_images: Positron emission tomography/computed tomography examination. The right hilar lymph nodes were enlarged with increased fluorodeoxyglucose metabolism. Other parts of the body showed no significant abnormalities.
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case_images: Other parts of the body showed no significant abnormalities (Figure 5).