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Random question

A 50 year old male had a recent chest x-ray for suspected pneumonia. The x-ray was normal with the exception of a small, rounded opacity. His symptoms resolved spontaneously. He subsequently underwent CT scanning, which showed a 3cm lesion in his left upper lobe. It remained unchanged on repeat imaging. Biopsy contained benign respiratory epithelium and fibrous tissue and repeat biopsy was not successful. After several years of serial imaging, there was a slight increase in lesion size and the patient opted for removal of the lesion. The pathology report showed a lesion measuring 4cm the contained respiratory, fibrous and fatty tissue, as well as mature hyaline cartilage. What is it?

Contributor: Trisha Maloney
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