Correct!
4. 1 or 3
TThe lesion in the RLL is enlarging and has increased FDG uptake suggesting malignancy. Delaying 3 months to repeat the CT scan would accomplish nothing. Which technique for biopsy depends on many factors the size and location of the lesion and includes local resources and expertise. Robotic bronchoscopy seemed a better option than a CT- guided biopsy, particularly given the location deep in the pulmonary parenchyma which increases the chances of a pneumothorax (Figure 4).
Figure 4. Robotic bronchoscopy showing the biopsy forceps in the lesion.
The biopsy results are shown in Figure 5 with positive staining for Congo red.
Figure 5. Histology of lung biopsy showing hematoxylin and eosin (H&E) staining (A) and Congo red staining (B).
The positive staining in this clinical situation for Congo red indicates? (Click on the correct answer to be directed to the fourth of six pages)