I.a I - Interstitial/parenchymal lung disease
I.a - Pneumonitis (ILD), acute and/or severe (may cause ARDS) I.b I - Interstitial/parenchymal lung disease
I.b - Pneumonitis (ILD) I.c I - Interstitial/parenchymal lung disease
I.c - Eosinophilic pneumonia (pulmonary infiltrates and eosinophilia) I.d I - Interstitial/parenchymal lung disease
I.d - Organizing pneumonia pattern (an area or areas of consolidation on imaging) I.f I - Interstitial/parenchymal lung disease
I.f - Acute fibrinous organizing pneumonia (AFOP) I.g I - Interstitial/parenchymal lung disease
I.g - Pulmonary fibrosis I.k I - Interstitial/parenchymal lung disease
I.k - Lung nodule or nodules I.l I - Interstitial/parenchymal lung disease
I.l - Diffuse alveolar damage (DAD) (see alsoo under IIb and XVf) I.p I - Interstitial/parenchymal lung disease
I.p - Fatal pneumonitis (ILD) I.v I - Interstitial/parenchymal lung disease
I.v - Abnormal lung function/pulmonary physiology (PFTs) without necessarily imaging or clinical evidence I.w I - Interstitial/parenchymal lung disease
I.w - Rapidly progressive ILD/pulmonary fibrosis (Hamman-Rich syndrome) II.b II - Pulmonary edema - Acute lung injury - ARDS
II.b - ARDS - Acute lung injury II.u II - Pulmonary edema - Acute lung injury - ARDS
II.u - Acute respiratory failure (e.g. from ARDS, ILD, PIE, OP, pulmonary edema or bronchospasm) requiring ECMO V.f V - Pleural and/or pericardial involvement
V.f - Pneumothorax V.p V - Pleural and/or pericardial involvement
V.p - Pleuroparenchymal fibroelastosis (PPFE) V.z V - Pleural and/or pericardial involvement
V.z - Pneumothorax (associated or secondary to drug-induced ILD) VI.c VI - Pulmonary vasculopathies
VI.c - Pulmonary veno-occlusive disease VI.f VI - Pulmonary vasculopathies
VI.f - Hemolytic and uremic syndrome (HUS). See also under Xaf VII.e VII - Mediastinal involvement
VII.e - Granulomatous mediastinal lymphadenopathy VII.h VII - Mediastinal involvement
VII.h - Pneumomediastinum XI.b XI - Miscellaneous
XI.b - Chest pain (acute or subacute), lone or prominent XI.c XI - Miscellaneous
XI.c - Pleuritic chest pain XV.a XV - Pathology
XV.a - Path: NSIP-cellular pattern (see also Ia, Ib) XV.b XV - Pathology
XV.b - Path: Eosinophilic pneumonia (subacute or acute) (see also Ic) XV.c XV - Pathology
XV.c - Path: Organizing pneumonia (OP/BOOP) pattern (see also Id) XV.d XV - Pathology
XV.d - Path: Acute fibrinous organizing pneumonia (AFOP-pattern) (see also If) XV.f XV - Pathology
XV.f - Path: Diffuse alveolar damage (DAD-pattern) (see also IL) XV.h XV - Pathology
XV.h - Path: NSIP-fibrotic pattern XV.i XV - Pathology
XV.i - Path: Pneumocyte atypia (reactive epithelial cells) (a.k.a. the "Napoleon Hat" sign) XV.j XV - Pathology
XV.j - Path: Pulmonary fibrosis (UIP-pattern) XV.l XV - Pathology
XV.l - Path: Pulmonary fibrosis (not otherwise specified or unclassifiable) XV.ax XV - Pathology
XV.ax - Path: Focal organizing pneumonia XV.be XV - Pathology
XV.be - Path: Interstitial pulmonary edema XV.bf XV - Pathology
XV.bf - Path: Pulmonary necrotizing granuloma or granulomas XVI.a XVI - Imaging
XVI.a - Imaging: Diffuse haze XVI.b XVI - Imaging
XVI.b - Imaging: Ground-glass opacities (GGO) / shadowing XVI.e XVI - Imaging
XVI.e - Imaging: Pulmonary opacities with a subpleural distribution XVI.k XVI - Imaging
XVI.k - Imaging: An area or areas of consolidation XVI.w XVI - Imaging
XVI.w - Imaging: Lung nodule or nodules XVI.ab XVI - Imaging
XVI.ab - Imaging: Cavitating/cavitary lung nodule, mass or nodules (see also Iq, XIs, XIIi, XVIaa and XVIIp) XVI.af XVI - Imaging
XVI.af - Imaging: Lung cysts or bullae (see also XVI ah/bf) XVI.bl XVI - Imaging
XVI.bl - Imaging: An area or areas of avid tracer uptake in the lung/chest on 18F-PET scan XVIII.j XVIII - Distinctive patterns - 'Eye-catchers'
XVIII.j - Eye-catcher: Avid lung uptake on 18F-PET-CT XIX.b XIX - Cytological, biochemical features of/in BAL, pleural fluid or FNA
XIX.b - BAL: An excess proportion of neutrophils XXIV.a XXIV - Veterinary medicine
XXIV.a - Veterinary: Pneumonitis - Interstitial lung disease XXIV.b XXIV - Veterinary medicine
XXIV.b - Veterinary: Pulmonary fibrosis

I.a I - Interstitial/parenchymal lung disease
I.a - Pneumonitis (ILD), acute and/or severe (may cause ARDS) I.b I - Interstitial/parenchymal lung disease
I.b - Pneumonitis (ILD) I.d I - Interstitial/parenchymal lung disease
I.d - Organizing pneumonia pattern (an area or areas of consolidation on imaging) I.f I - Interstitial/parenchymal lung disease
I.f - Acute fibrinous organizing pneumonia (AFOP) I.h I - Interstitial/parenchymal lung disease
I.h - Subclinical pulmonary infiltrates/ILD I.l I - Interstitial/parenchymal lung disease
I.l - Diffuse alveolar damage (DAD) (see alsoo under IIb and XVf) I.m I - Interstitial/parenchymal lung disease
I.m - ILD with a granulomatous component I.p I - Interstitial/parenchymal lung disease
I.p - Fatal pneumonitis (ILD) I.v I - Interstitial/parenchymal lung disease
I.v - Abnormal lung function/pulmonary physiology (PFTs) without necessarily imaging or clinical evidence I.y I - Interstitial/parenchymal lung disease
I.y - Progression, acceleration or exacerbation of preexisting ILD/fibrosis I.ad I - Interstitial/parenchymal lung disease
I.ad - Radiation recall pneumonitis II.b II - Pulmonary edema - Acute lung injury - ARDS
II.b - ARDS - Acute lung injury III.a III - Pulmonary/alveolar./airway hemorrhage/bleeding
III.a - Alveolar hemorrhage (AH), diffuse AH (DAH) III.h III - Pulmonary/alveolar./airway hemorrhage/bleeding
III.h - Major/massive hemoptysis IV.d IV - Airway involvement
IV.d - Cough (lone) V.h V - Pleural and/or pericardial involvement
V.h - Chylothorax V.i V - Pleural and/or pericardial involvement
V.i - Pleuritis (can cause chest pain) VI.a VI - Pulmonary vasculopathies
VI.a - Pulmonary embolism - Venous thrombosis/thromboembolism VIII.a VIII - Central-large-upper airway (incl. pharyngeal-nasal) involvement
VIII.a - Angioedema (may cause UAO, asphyxia and death) XV.a XV - Pathology
XV.a - Path: NSIP-cellular pattern (see also Ia, Ib) XV.c XV - Pathology
XV.c - Path: Organizing pneumonia (OP/BOOP) pattern (see also Id) XV.d XV - Pathology
XV.d - Path: Acute fibrinous organizing pneumonia (AFOP-pattern) (see also If) XV.e XV - Pathology
XV.e - Path: ILD with a granulomatous component (see also Im) XV.g XV - Pathology
XV.g - Path: Alveolar hemorrhage (see also IIIa) XVI.b XVI - Imaging
XVI.b - Imaging: Ground-glass opacities (GGO) / shadowing XVI.bl XVI - Imaging
XVI.bl - Imaging: An area or areas of avid tracer uptake in the lung/chest on 18F-PET scan XVII.e XVII - Infections & related conditions
XVII.e - Pneumocystis jiroveci pneumonia

I.a I - Interstitial/parenchymal lung disease
I.a - Pneumonitis (ILD), acute and/or severe (may cause ARDS) I.b I - Interstitial/parenchymal lung disease
I.b - Pneumonitis (ILD) I.d I - Interstitial/parenchymal lung disease
I.d - Organizing pneumonia pattern (an area or areas of consolidation on imaging) I.l I - Interstitial/parenchymal lung disease
I.l - Diffuse alveolar damage (DAD) (see alsoo under IIb and XVf) I.m I - Interstitial/parenchymal lung disease
I.m - ILD with a granulomatous component I.p I - Interstitial/parenchymal lung disease
I.p - Fatal pneumonitis (ILD) III.a III - Pulmonary/alveolar./airway hemorrhage/bleeding
III.a - Alveolar hemorrhage (AH), diffuse AH (DAH) VI.d VI - Pulmonary vasculopathies
VI.d - Pulmonary vasculitis or capillaritis VIII.a VIII - Central-large-upper airway (incl. pharyngeal-nasal) involvement
VIII.a - Angioedema (may cause UAO, asphyxia and death) XI.w XI - Miscellaneous
XI.w - Cavitation/necrosis of lung tumor or metastases XV.g XV - Pathology
XV.g - Path: Alveolar hemorrhage (see also IIIa) XVI.bf XVI - Imaging
XVI.bf - Imaging: Tumoral cavitation XVII.a XVII - Infections & related conditions
XVII.a - Respiratory tract infection incl. pneumonia