The US features, although generally benign, are not specific. Tissue sampling with fine-needle aspiration biopsy is recommended. Core biopsy is necessary if a diagnosis cannot be made with the aspirate but is not performed initially because of the possibility of milk fistula formation.

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Plastic materials are ubiquitous in our environment1. Inhaled plastic and cellulose microfibers are frequently found in healthy lung and malignant lung histological specimens2. We present a unique case of visible fibers obtained on the transbronchial biopsy suspicious of a foreign body with pathology demonstrating underlying malignancy.