TABLE 1.

Childhood interstitial lung disease diagnostic assessment based on computed tomography scan pattern

Elementary lesions	Distribution	Suspected diagnoses
GGO	Dense, diffuse	Inherited surfactant disorders
GGO, peripheral traction cysts	Diffuse	Inherited surfactant disorders
GGO, peripheral and/or parenchymal traction cysts, traction bronchiectasis, reticulations		Inherited surfactant disorders (older age); autoinflammatory disorders
Diffuse (sometimes ill-defined centrilobular) nodules, diffuse GGO ± alveolar consolidation	Patchy	Diffuse alveolar haemorrhage
GGO, cysts, honeycombing and reticulations	Peripheral	Connective tissue diseases, systemic and autoimmune diseases
GGO	Paramediastinal, paracardial, middle lobe, lingula (usual); others (aberrant)	Persistent tachypnoea of infancy/neuroendocrine cell hyperplasia of infancy
GGO and air trapping	Centrilobular	Hypersensitivity pneumonitis
Reversed halo sign		Organising pneumonia
Crazy paving	More intense in lower lobes	Pulmonary alveolar proteinosis
Micronodules, hilar lymphadenopathies	Lymphatic distribution	Sarcoidosis
Centrilobular nodules	Diffuse	Hypersensitivity pneumonitis

GGO: ground-glass opacities.