CT scan of lung bases with interstitial lung disease

The high resolution CT scan of the bases of the lungs in the axial projection (A) reveals bibasilar reticular pattern with traction bronchiectasis at the right base (highlighted and magnified in green with arrow in B, and blue in C); ground glass changes better seen in the left base (D, yellow arrow). Image E (magnified with red overlay) reveals a secondary lobule with thickened interlobular septa and centrally placed arteriole. While not pathognomonic, the changes are consistent with NSIP associated with polymyositis and dermatomyositis.