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.g I - Interstitial/parenchymal lung disease
I.g - Pulmonary fibrosis I.h I - Interstitial/parenchymal lung disease
I.h - Subclinical pulmonary infiltrates/ILD 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.m I - Interstitial/parenchymal lung disease
I.m - ILD with a granulomatous component I.q I - Interstitial/parenchymal lung disease
I.q - Pulmonary nodulosis 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) I.aa I - Interstitial/parenchymal lung disease
I.aa - Delayed ILD, -pneumonitis, -fibrosis II.a II - Pulmonary edema - Acute lung injury - ARDS
II.a - Pulmonary edema, noncardiogenic (NCPE) 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) IV.a IV - Airway involvement
IV.a - Bronchospasm - Wheezing - Asthma IV.d IV - Airway involvement
IV.d - Cough (lone) V.a V - Pleural and/or pericardial involvement
V.a - Pleural effusion (uni- or bilateral) (can accompany DI-LDs) V.b V - Pleural and/or pericardial involvement
V.b - Eosinophilic pleural effusion V.e V - Pleural and/or pericardial involvement
V.e - Hemothorax - Serosanguineous pleural effusion V.i V - Pleural and/or pericardial involvement
V.i - Pleuritis (can cause chest pain) V.n V - Pleural and/or pericardial involvement
V.n - Hemopericardium - Bloody pericardial effusion V.s V - Pleural and/or pericardial involvement
V.s - Serositis - Polyserositis VI.a VI - Pulmonary vasculopathies
VI.a - Pulmonary embolism - Venous thrombosis/thromboembolism VII.a VII - Mediastinal involvement
VII.a - Lymphadenopathy (intrathoracic) VIII.a VIII - Central-large-upper airway (incl. pharyngeal-nasal) involvement
VIII.a - Angioedema (may cause UAO, asphyxia and death) VIII.aj VIII - Central-large-upper airway (incl. pharyngeal-nasal) involvement
VIII.aj - Endobronchial lymphoproliferative disorder X.f X - Systemic/Distant conditions, syndromes and reactions
X.f - Anaphylaxis-Anaphylactoid reaction (can be fatal) X.k X - Systemic/Distant conditions, syndromes and reactions
X.k - Sarcoid-like granulomatosis (endo-/extrathoracic) X.u X - Systemic/Distant conditions, syndromes and reactions
X.u - Multiple organ dysfunction/failure (MODS/MOF) XI.b XI - Miscellaneous
XI.b - Chest pain (acute or subacute), lone or prominent XI.c XI - Miscellaneous
XI.c - Pleuritic chest pain XII.c XII - Cardiovascular involvement / toxicity
XII.c - Pericardial effusion (w/wo tamponade) XIII.b XIII - Neoplastic conditions
XIII.b - Lymphoproliferative disease (pulmonary, endobronchial, endothoracic) XIII.g XIII - Neoplastic conditions
XIII.g - Lymphomatoid granulomatosis (pulmonary, endothoracic) XIII.k XIII - Neoplastic conditions
XIII.k - Lymphoproliferative disease (extrathoracic) 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.e XV - Pathology
XV.e - Path: ILD with a granulomatous component (see also Im) 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.w XV - Pathology
XV.w - Path: Pulmonary edema (see also II/IIa) XV.bq XV - Pathology
XV.bq - Path: Lymphoproliferative disease, endothoracic XVI.b XVI - Imaging
XVI.b - Imaging: Ground-glass opacities (GGO) / shadowing 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.bc XVI - Imaging
XVI.bc - Imaging: Intrathoracic lymph node enlargement XVII.b XVII - Infections & related conditions
XVII.b - Opportunistic pulmonary/systemic infections XVII.d XVII - Infections & related conditions
XVII.d - Pneumocystis jiroveci pulmonary colonization XVII.e XVII - Infections & related conditions
XVII.e - Pneumocystis jiroveci pneumonia XVII.h XVII - Infections & related conditions
XVII.h - Nontuberculous pulmonary mycobacterial infection/superinfection XVII.q XVII - Infections & related conditions
XVII.q - Viral pneumonia XIX.a XIX - Cytological, biochemical features of/in BAL, pleural fluid or FNA
XIX.a - BAL: An excess proportion of lymphocytes XIX.b XIX - Cytological, biochemical features of/in BAL, pleural fluid or FNA
XIX.b - BAL: An excess proportion of neutrophils XIX.c XIX - Cytological, biochemical features of/in BAL, pleural fluid or FNA
XIX.c - BAL: An excess proportion of eosinophils

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.e I - Interstitial/parenchymal lung disease
I.e - Acute eosinophilic pneumonia (AEP) I.g I - Interstitial/parenchymal lung disease
I.g - Pulmonary fibrosis I.l I - Interstitial/parenchymal lung disease
I.l - Diffuse alveolar damage (DAD) (see alsoo under IIb and XVf) I.r I - Interstitial/parenchymal lung disease
I.r - An imaging pattern consistent with DIP I.v I - Interstitial/parenchymal lung disease
I.v - Abnormal lung function/pulmonary physiology (PFTs) without necessarily imaging or clinical evidence I.ax I - Interstitial/parenchymal lung disease
I.ax - Chronic pneumonitis II.a II - Pulmonary edema - Acute lung injury - ARDS
II.a - Pulmonary edema, noncardiogenic (NCPE) II.b II - Pulmonary edema - Acute lung injury - ARDS
II.b - ARDS - Acute lung injury II.j II - Pulmonary edema - Acute lung injury - ARDS
II.j - Transient pulmonary opacities/infiltrates (see also under Iav) III.a III - Pulmonary/alveolar./airway hemorrhage/bleeding
III.a - Alveolar hemorrhage (AH), diffuse AH (DAH) IV.a IV - Airway involvement
IV.a - Bronchospasm - Wheezing - Asthma IV.ae IV - Airway involvement
IV.ae - Tracheobronchitis-like clinical pattern V.a V - Pleural and/or pericardial involvement
V.a - Pleural effusion (uni- or bilateral) (can accompany DI-LDs) V.b V - Pleural and/or pericardial involvement
V.b - Eosinophilic pleural effusion V.d V - Pleural and/or pericardial involvement
V.d - Pleural/pericardial effusion, ANA positive (DI lupus) V.i V - Pleural and/or pericardial involvement
V.i - Pleuritis (can cause chest pain) VI.d VI - Pulmonary vasculopathies
VI.d - Pulmonary vasculitis or capillaritis VII.a VII - Mediastinal involvement
VII.a - Lymphadenopathy (intrathoracic) VIII.b VIII - Central-large-upper airway (incl. pharyngeal-nasal) involvement
VIII.b - Hematoma of/around central airway wall potentially causing UAO IX.i IX - Neuromuscular / CNS involvement - Disordered breathing during sleep
IX.i - Respiratory arrest - Apnea X.a X - Systemic/Distant conditions, syndromes and reactions
X.a - DRES syndrome - DRESS-like reaction X.d X - Systemic/Distant conditions, syndromes and reactions
X.d - Lupus - Lupus syndrome (see also Vd) X.e X - Systemic/Distant conditions, syndromes and reactions
X.e - Autoimmunity-Autoimmune conditions (+ANA, +anti-ds-DNA, +ANCAs, other auto-Abs) X.f X - Systemic/Distant conditions, syndromes and reactions
X.f - Anaphylaxis-Anaphylactoid reaction (can be fatal) X.s X - Systemic/Distant conditions, syndromes and reactions
X.s - Vasculitis, pulmonary (w/wo AH), extrapulmonary, systemic: ANCA-positive 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.e XV - Pathology
XV.e - Path: ILD with a granulomatous component (see also Im) 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.j XV - Pathology
XV.j - Path: Pulmonary fibrosis (UIP-pattern) XV.k XV - Pathology
XV.k - Path: Desquamative interstitial pneumonia (DIP-pattern) XV.x XV - Pathology
XV.x - Path: Acute/subacute bronchiolitis (see also IVc, IVi) XV.ac XV - Pathology
XV.ac - Path: Pulmonary vasculitis other than capillaritis XV.af XV - Pathology
XV.af - Path: Granulomatous pulmonary vasculitis XV.bi XV - Pathology
XV.bi - Path: Giant-cell interstitial pneumonia (GIP)-pattern XV.bl XV - Pathology
XV.bl - Path: Resolving alveolar damage XVI.b XVI - Imaging
XVI.b - Imaging: Ground-glass opacities (GGO) / shadowing XVI.f XVI - Imaging
XVI.f - Imaging: Bibasilar opacities/shadowing XVI.l XVI - Imaging
XVI.l - Imaging: Peribronchovascular areas of consolidation XVI.bc XVI - Imaging
XVI.bc - Imaging: Intrathoracic lymph node enlargement XVI.bp XVI - Imaging
XVI.bp - Imaging: Reverse ventilation-perfusion mismatch