Radiographic Changes

Chest radiographs taken in 10/99 show a 3 x 4 cm, ovoid mass in the superior segment of the right lower lobe. It abuts the major fissure on the lateral film.

CT shows a mildly lobular, ovoid mass that is contiguous with the major fissure in the right lower lobe. The pleural irregularities present on both sides posteriorly had been unchanged over years. What do they represent? Answer

The soft tissue window shows the homogeneous, non-calcified nature of the nodule and the lack of mediastinal adenopathy. What is the differential diagnosis of this slowly-growing nodule? Answer

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The pleural irregularities present on both sides posteriorly had been unchanged over years. What do they represent?

Answer: These most likely represent nonspecific pleural plaques of asbestos exposure.

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What is the differential diagnosis of this slowly-growing nodule?

Answer: The differential diagnosis includes hamartoma/lipoma, carcinoid tumor, low-grade adenocarcinoma, nodular lymphoid hyperplasia (pseudolymphoma), sclerosing hemangioma, hemangioendothelioma, hyalinizing granuloma, and amyloidoma.

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