Fig. 1

Two sets of thoracic radiographs performed 2 months apart in a 1-year old cat presenting for progressive respiratory disease. Initial lateral (A) and ventrodorsal (B) projections provided by the primary care veterinarian showing an unremarkable lung field. The opacity (*) cranial to the cardiac silhouette was attributed to thymus and/or fat in the mediastinum. Lateral (C) and ventrodorsal (D) projections were repeated 2 months later following worsening of respiratory signs. A diffuse bronchointerstitial pattern with multifocal discrete patchy areas of alveolar pattern (*) is now seen