[en] High-resolution computed tomography (HRCT) provides precise imaging of lung parenchyma and is most useful in the investigation of diffuse interstitial lung disease (DILD). It involves thin collimation and high frequency reconstruction algorithm, and requires knowledge of the secondary pulmonary lobule anatomy. Its interpretation is facilitated by recognition of elementary signs (peri-broncho-vascular thickening, septal thickening, ground glass attenuation, etc.) which can be grouped in a HRCT pictorial glossary. In a quiz format, readers are asked to diagnose twelve cases of classical DILD with clinical correlation. (authors)