The biopsy site in a particular case should be based on the CT findings in this often patchy disease.
Endobronchial Lymphatic Carcinomatosis
The respiratory mucosa of this bronchus shows multiple lymphatics dilated by tumor. Note the lack of fibrosis.
In this case, endobronchial biopsy could confirm the diagnosis.
Find the largest lymphatic with tumor.
Find the bronchial cartilage.
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Largest lymphatic filled with tumor