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Table 1 Ancillary CT findings suggesting other diagnoses in patients with a predominat UIP-like pattern.

From: Highlights of HRCT imaging in IPF

Atypical CT features

Probable diagnosis

Centrilobular nodules

Air trapping

Relative sparing of bases

Hypersensitivity

Pneumonitis

Pleural effusion; pleural thickening; esophageal dilation

Collagen Vascular disease

Pleural plaques

Asbestosis

Multiple septal or bronchovascular nodules in addition to reticulation

Fibrosing Sarcoid