List To Memorise Flashcards
Tracheal / Bronchial Narrowing Mass or Occlusion - Different Levels
(A) Subglottic stenosis
- Post-intubation
- Wegener’s Granulomatosis
- Rhinoscleroma
(B) Diffuse thickening 1. Acute infection 2. Amyloidosis 3. Wegener’s granulomatosis 4. Sarcoidosis 5. IBD Relapsing polychondritis Tracheobronchopathia osteochondroplastica
Focal thickening: 1. Tumour 2. Post-infective (TB, histoplasmosis) 3. Tracheobronchial papillomatosis Wegner’s Amyloid
Others:
- Foreign body
- Carcinoid
- Lung cancer
- Bronchial atresia
Tracheal / Bronchial Narrowing
(A) Intraluminal
- Mucus plug
- Foreign body (air trapping > atelectasis)
- Broncholithiasis (calcified LN eroding into adjacent bronchus)
- Misplaced ETT
(B) Luminal
- Tracheal/bronchial tumours (SCC > Carcinoid > Adenoid cystic carcinoma. Met, mucoepidermoid carcinoma, endobronchial harmatoma, tracheobronchial papillomatosis.)
- Inflammation/Infiltration/Fibrosis (Wegener, TB/Fungal, amyloidosis - does not spare posterior wall, relapsing polychondritis, TO, sarcoidosis, IBD - UC > Crohn’s)
- Bronchial atresia (most common apicoposterior segment of LUL + hyperlucent lung)
- Tracheobronchomalacia (dynamic airway collapse)
- Tracheobronchial injury (smooth stenosis)
- Congenital tracheal stenosis (complete cartilage rings)
(C) Extra-luminal
- Lymphadenopathy
- Mediastinal mass (smooth, eccentric)
- Fibrosing mediastinitis (due to histoplasmosis, radiotherapy, autoimmune disease)
- Enlarged LA/PA (Eisenmenger’s syndrome, absent pulm valve)
- AA (indents left sided trachea)
- Left pulm artery sling
Bronchiectasis
(Tram track or signet ring signs)
Ancillary signs: volume loss, mucus plugging/tree-in-bud, mosaic attenuation
(A) Upper zone predominant
- Cystic fibrosis
- Post TB
- Sarcoidosis
(B) Middle zone predominant
- ABPA (Immunological, asthmatic patient, focal , mucous filled)
- Mycobacterium avium complex infection (older women, Lady Windermere syndrome)
(C) Lower zone predominant
- Post infection (chronic aspiration, influenza, immunodeficiency)
- Alpha-1 antitrypsin deficiency (basal predominant panlocular emphysema)
- Primary ciliary dyskinesia (50% have situs abnormalities, classic triad of Kartagener syndrome)
- Obliterative bronchiolitis (mosaic attenuation due to air trapping)
Others:
- Traction bronchiectasis from fibrosis
- Secondary to bronchial obstruction
- Congenital: Mounier-Kuhn syndrome, Williams-Campbell syndrome
- Idiopathic
- Sawyer-James syndrome (childhood infection)
Unilateral hypertransradiant hemithorax
Decreased vessel on one side
(A) Chest Wall
- Mastectomy (absent breast & pec muscle shadow)
- Poliomyelitis (atrophy pettorali muscle, shoulder girdle, humerus)
- Poland syndrome (unilateral absence pectoral muscle +/- rib defect, seen in 10% of syndactyly)
(B) Pleura
1. Pneumothorax
(C) Lung
- Airway obstruction (contralateral mediastinal shift)
- Compensatory hyperexpansion (eg: following lobectomy)
- Unilateral bullae (vessel absent)
- Congenital lobar overinflation (LU > RM > RUL). Ipsilateral lobes are compressed +/- contralateral mediastinal shift.
- Swyer-James syndrome (normal or reduced lung V with airtrapping on expiration. Ipsilateral vessels are small)
(D) Pulmonary vessels
1. Main or lobar PE (Westermark sign, dilated proximal pulm artery, ipsilateral loss of V)
Bilateral Hypertransradiant hemithoraces
(A) normal or small lungs
- B/L anterior pneumothoraces
- Pulmonary oligaemia (secondary to cyanotic heart disease)
(B) over expanded lungs
- Emphysema (centrilobular = more on upper/mid zone, panlobular = lower zones)
- Asthma (airway remodelling)
- Acute bronchiolitis (in infants, due to small airway obstruction +/- bronchial wall thickening)
- Tracheal, laryngeal, B/L bronchial stenoses
Increased density in one hemithorax
(A) Undisplaced mediastinum
- Consolidation
- Pleural effusion (supine CXR +/- apical ‘cap’ fluid) *pulm vessel will be visible through the increased density (vs consolidation)
- Malignant pleural mesothelioma
(B) Mediastinal displacement away from dense hemithorax
- Very large pleural effusion
- Very large intrathoracic tumour (solitary fibrous tumour of pleura, Ewing sarcoma of chest wall)
- Diaphragmatic hernia
(C) Mediastinal displacement towards dense hemithorax
- Lung collapse
- Lymphangitis carcinomatosa: (linear & nodular opacities + septal lines +/- ipsilateral hilar/mediastinal lymphadenopathy). B/L symmetrical infiltration vs unilateral in lung CA.
- Pulmonary agenesis, aplasia, hypoplasia: absent or hypoplastic pulmonary artery
- Malignant pleural mesothelioma
- Post pneumonectomy
Air-space opacification / consolidation
Obscuring vessel/bronchial walls +/- air bronchogram
- Oedema
- Infection
- Haemorrhage: Goodpasture’s syndrome, Wegener’s granulomatosis, idiopathic pulmonary haemosiderosis, microscopic polyangiitis, SLE, Behçet’s disease, contusion, infarct
- Organising pneumonia (infection, drug toxicity, connective tissue disease)
- Malignancy (adenocarcinoma, lymphoma)
- Sarcoidosis: 20% can have airspace pattern
- Lipoid pneumonia
Non-resolving / Recurrent Consolidation
- Bronchial obstruction
- Malignancy
- Recurrent aspiration
- Organising pneumonia
- Sarcoidosis
- Vasculitis: Wegener’s, Churg-Strauss
- Inappropriate antimicrobial therapy
- Preexisting lung pathology eg: bronchiectasis
- Impaired immunity
Migratory consolidation
- Eosinophilic pneumonia (simple or chronic - peripheral upper zone distribution)
- Organising pneumonia (predominantly mid-lower zones)
- Recurrent aspiration
- Pulmonary haemorrhage/infarct/vasculitis
- Alveolar proteinosis
Consolidation with an enlarged hilum
(A) Primary pneumonia
- Primary TB
- Mycoplasma pneumonia (lymphadenopathy rare in adult but common in children)
- Primary histoplasmosis (LN calcified post healing)
- Viral pneumonia
- Coccidiodomycosis
(B) Secondary pneumonia
Pneumonia involving all or part of one lobe
- Klebsiella: multilobar, risk of cavitation or lobar enlargement
- Staphylococcal pneumonia: 40-60% of whom develop pneumatocoele, parapneumonic effusion, empyema, pneumothorax, bronchopleural fistula
- Strep: most common. Usually unilocular
- TB: anterior segment of upper lobe, medial segment of middle lobe
- Strep pyogenic: affects lower lobes, pleural effusion, empyema
Consolidation with bulging of fissure
- Infection with abscess: kleb, strep, mycobaterium, Yersinia
- Abscess: Staph, Kleb, gra -ve organism
- Lung cancer: adenocarcinoma
Unilateral pulmonary oedema
(A) Ipsilateral to underlying abnormality
1. Unilateral aspiration
2. Pulmonary contusion
3. Mitral regurgitation (jet flew into right upper pulmonary vein, causes RUL oedema)
4. Bronchial obstruction
5. large systemic artery to pulmonary artery shunts
Others: prolonged lateral decubitus position, rapid lung reexpansion post thoracocentesis, repercussion injury postpulmonary vascular surgery/stent
(B) Contralateral to underlying abnormality (typically a perfusion defect)
- Congenital absence/hypoplasia of a pulmonary artery
- Thromboembolism
- Unilateral emphysema
- Lobectomy
- Pleural disease
- Sawyer-James syndrome
Septal Kerley B lines
-any disease involving pulmonary vein, Lymphatics and interstitium
(A) Pulmonary venous hypertension/engorgement
-mitral stenosis, pulmonary vein stenosis
(B) Lymphatics/interstitial infiltrates
- Lymphangitis carcinomatosa (nodular interlobular septal thickening)
- Interstitial lung disease
- Sarcoidosis (nodular)
- Pneumoconioses (widespread nodularities)
- Alveolar proteinosis (smooth thickening + geographic areas of GGO - crazy-paving pattern)
- Acute eosinophilic pneumonia
- Amyloidosis
- Congenital lymphangiectasia: abnormal dilatation of lymphatic channels without increase in their number (vs lymphangiomatosis)
Others: idiopathic bronchiectasis, recurrent diffuse pulmonary haemorrhage, diffuse pulmonary lymphangiomatosis, lysosomal storage disease, alveolar microlithiasis, Erdeim-Chester disease (infiltrated by non-Langerhans type histiocytes in mid/upper zone, associated with GGP, centrilobular nodules, chylous pleural effusion)
Multiple lung nodules (=<3cm)
(A) Multiple micronodules < 2mm
- Soft tissue or GG attenuation: military TB, fungal infection, Coal worker’s pneumoconiosis, sarcoidosis, Berylliosis
- Greater than soft tissue density: silicosis (sparing of bases & spices), post varicella infection (multiple tiny calcific nodules, haemosiderosis (due to chronic raised venous pressure, repeated haemorrhag), siderosis, stannosis, barytosis, post lymphangiography, limestone & marble worker, alveolar microlithiasis
(B) Multiple nodules 2-5 mm
- Soft tissue/GG: disseminated CA, subacute hypersensitivity pneumonitis (centrilobular nodules, GGO, lobular air trapping +/- scattered thin-walled cyst), respiratory bronchiolitis (linked to smoking +/- thickened interlobular septa, limited emphysema), sarcoidosis, lymphoma
- Tend to confluence/varying in appearance over hours/days: multifocal pneumonia, pulmonary oedema, diffuse pulm haemorrhage
(C) Multiple nodules greater than 5mm
- Neoplastic: Met, Kaposi sarcoma, benign met eg: uterine leiomyoma, pleomorphic adenoma of salivary gland, giant cell tumour of bone, chondroblastoma, meningioma)
- Infection: abscess, hydatid (right side lower zone, may rupture), histoplasmosis, coccidiodomycosis (upper lobes)
- Immunological: wegener’s granulomatosis, rheumatoid nodule (peripheral, lower zones) , progressive massive fibrosis (large conglomerate masses in mid-upper zones symmetrical, start peripheral & migrate centrally over years), Organising pneumonia, Amyloidosis, Hyalinising granuloma
(D): Vascular
-AV malformation