PMC6349978_01
(a) A chest CT displaying an endobronchial mass entirely occupying the right lower lobar bronchus. (b) PET/CT revealing a hypermetabolic nodule in the right lower lobar bronchus and diffuse hypometabolism (arrowheads) of the right lower lobe lung. (c) Coronal chest CT showing that the right lower lobar bronchus was obstructed by an endobronchial mass. (d) Coronal PET/CT showing that a hypermetabolic mass obstructs the right lower lobar bronchus and lobar hypometabolism (arrowheads). CT: computed tomography; PET: positron emission tomography.
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Although the patient was a nonsmoker and had complained of no respiratory symptoms, the chest CT revealed that the right lower lobe (RLL) bronchus was obstructed with segmental atelectasis (Figure 1(a) and (c)). It was a suspicious secretion stasis because the patient was nearly bed-ridden and weakened; however, positron emission tomography (PET)/CT revealed a hypermetabolic mass (SUVmax = 10.0) in the RLL bronchus with a diffuse hypometabolism of the RLL of the lung (Figure 1(b) and (d)).
(a) Bronchoscopy showing an endobronchial mass occluding the right lower lobe bronchus. (b) A histological examination revealing atypical glandular cells similar to those of the endometrial carcinoma (hematoxylin and eosin staining, x200). (c) Histology of the primary endometrial cancer showing pleomorphic tumor cells with prominent nuclear atypia (hematoxylin and eosin staining, x200).
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The bronchoscopy revealed an endobronchial tumor obstructing the RLL bronchus (Figure 2(a)). To differentiate primary lung cancer from a metastasis, a bronchoscopic biopsy was performed and confirmed it was an endometrial cancer metastasis (Figure 2(b)). The pathology of the primary endometrial malignancy was reviewed, and it showed a similar pattern with an endobronchial lesion (Figure 2(c)).