A 53-year-old man comes in with a cough, chest pain, and dyspnea that he’s had for several weeks. Radiographic imaging of the chest reveals a mass lesion in the right lower lobe.
Correct answer: D. Amyloid tumor (Amyloidoma)
An amyloid tumor can present as solitary intrapulmonary mass in patients without any previous history of amyloidosis or plasma cell disease. However, in such cases, it is prudent to properly evaluate for such a possibility. Performing a Congo Red stain will show under polarized light microscopy an apple green reaction, highlighting the amorphous material present.