2001 Eur Radiol_Intracranial Hemorrhage_principles of CT and MRI Interpretation
20130426 Manos Uses Limitations and Interpretation of CT in … Lifelong...
Transcript of 20130426 Manos Uses Limitations and Interpretation of CT in … Lifelong...
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Uses, limitations and interpretation
of CT in pulmonary infections: A practical approach
Daria Manos Canadian Association of Radiologists 2013
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DISCLOSURES
Speakers honorarium, Siemens Canada
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Objectives
1. Recognize and differentiate the HCRT patterns of specific pulmonary infections, including those involving the immunocompromised host.
2. Identify non-infectious mimics of pulmonary infections and recognize the role of the radiologist in directing appropriate clinical work up and treatment.
3. Identify infectious mimics of neoplastic processes.
Daria Manos
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CASE 1 : Which is most likely to represent PCP?
Daria Manos
50 yo male: chronic steroids 24 yo male: IVDU, HIV+ living on street
38 yo female: cachexia, 6 weeks of cough 60 yo female: 7 days post SCT
A B
C D
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Daria Manos
50 yo male: chronic steroids
A
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Daria Manos
24 yo male: IVDU, HIV+ living on street
B
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Daria Manos
38 yo female: cachexia, 6 weeks of cough
C
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Daria Manos
60 yo female: 7 days post SCT
D
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CASE 1: Answer Which is most likely to represent PCP?
Daria Manos
50 yo male: chronic steroids 24 yo male: IVDU, HIV + living on street
38 yo female: cachexia, 6 weeks of cough 60 yo female: 7 days post SCT
A B
C D
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Pneumocystis jiroveci pneumonia
PCP no longer the most common respiratory infection in AIDS. Now with Septra prophylaxis – changing demographic.
HIV with poor health care (IVDU) HIV not yet diagnosed Non-HIV immunocompromised – high dose corticosteroids,
chemotherapy, transplant, hematologic malignancies 30% will have normal CXR Diagnosis:
Induced sputum and PCR May need BAL
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HISTORY: Few days of cough and fever. TRIAGE NOTE: often hypoxic
Daria Manos
PCP in 75 yo with CLL - Abnormal CXR in ED Progression over 3 days
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Early – bilateral perihilar ggo, interstitial thickening, hazy vessels. No effusion.
QE 900158
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QE 900158
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Daria Manos
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QEII 900158
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Patchy, often geographic
Daria Manos
Why is this not alveolar proteinosis or HP?
Can see crazy paving.
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Look for cysts or cavitation within ground glass
QEII 1382658
Cysts/pneumatoceles in 10-38%
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Atypical QEII 1536192
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VGH 3379210
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QEII 1536192
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Can be nodular
QE II 900158
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atypical VGH 2424609
but not pure tree in bud
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Dense air space consolidation possible
VGH 1515666
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typical QE 900158
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atypical QE 1520424
Lobar consolidation rare
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PCP and Respiratory infections in HIV
Daria Manos
Bacterial
Post primary Tb
MAC
PCP
CMV
Fungal Toxoplasmosis
Primary Tb
CD4 50 100 200 400
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Course of events and risks associated with allogeneic transplantation. Léger C S , and Nevill T J CMAJ 2004;170:1569-1577
Respiratory Infection post Stem cell transplant
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CT for Immunocompromised Patients
CT often adds little compared to CXR and clinical history.
Weigh the risks of CT. Consider low dose.
Indications for CT: normal CXR but high suspicion non-specific CXR pattern guiding invasive procedures assessing complications (eg effusion)
Daria Manos
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Diffuse ggo in immunocompromised Infection clinically: PCP
Viral (CMV, herpes, RSV)
Daria Manos CMV case courtesy Geoff Marshall
CMV PCP
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Diffuse ggo in immunocompromised
Infection clinically: PCP Viral (CMV, herpes, RSV)
Specifically mention possibility of PCP and CMV.
Induced sputum not very sensitive. Made need bronchoscopy to diagnose.
Daria Manos
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Diffuse ggo in immunocompromised
If alternate clinical presentation:
Consider other causes of ground glass opacity
Daria Manos
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Daria Manos
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Case 2: What is the most likely diagnosis?
History: 65 yo man with productive cough
Daria Manos
10 months earlier
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Case 2: What is the most likely diagnosis?
History: 65 yo man with productive cough
Daria Manos
10 months earlier
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Case 2: What is the most likely diagnosis?
A. Tuberculosis. B. Central obstructing tumor. C. Mucinous adenocarcinoma. D. Organizing pneumonia.
Daria Manos
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Daria Manos
10 months earlier
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“Non-resolving pneumonia”
Daria Manos
• Pathogen factors • Host factors Infectious
• Consolidative adenocarcinoma • Lymphoma • Kaposi Sarcoma
Neoplastic
• Lipoid Pneumonia • Organizing Pneumonia • Eosinophilic Pneumonia • Scar/radiation
Inflammatory 20%
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Non resolving pneumonia
Pathogen factors: severe – up to 10 wks complex, abscess resistant penicillin – 50% strep levofloxacin – 5% strep
misdiagnosed tb, fungal, nocardia,
actino Host factors:
DM, COPD, EtOh, age Daria Manos
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Tuberculosis
Dx may be difficult SNTB Altered in HIV
Consider risk factors HIV endemic areas institutionalization
Daria Manos
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Lipoid Pneumonia
Aspiration of oil/fat Consolidation may be fatty density
Fibrosis
Daria Manos Courtesy Geoff Marshall
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Scar / radiation
Radiation fibrosis 6 to 12 months post > 20Gy Stereotactic radiation:
not as obvious
Daria Manos
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Chronic Eosinophilic pneumonia
3+ months Peripheral and upper Patchy Neg of pulm edema
Daria Manos
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Chronic Eosinophilic pneumonia
3+ months Peripheral and upper Patchy Neg of pulm edema
Daria Manos
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Chronic Eosinophilic pneumonia
3+ months Peripheral and upper Patchy Neg of pulm edema
Daria Manos
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Chronic Eosinophilic pneumonia
3+ months Peripheral and upper Patchy Neg of pulm edema
Daria Manos
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Cryptogenic organizing pneumonia
Pattern of lung reaction Idiopathic (COP) or 2o
Patchy peripheral and peribronchovascuar consolidation and ggo Lower predominant
Can recur Can migrate
Daria Manos
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Daria Manos
CEP and OP
Reverse halo, atoll sign, perilobular consolidation, lobular sparing
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Lymphoma
Daria Manos
Extranodal – NHL > HL
In lung: consolidation masses nodules interstitial
thickening
Progressive mass-like consolidation.
4 months later
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Adenocarcinoma- mucinous subtype
Daria Manos
“mucinous BAC” “pneumonic BAC” endobronchial spread
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Adenocarcinoma- mucinous subtype
Daria Manos
“mucinous BAC” “pneumonic BAC” endobronchial spread
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Adenocarcinoma- mucinous subtype
Daria Manos
“mucinous BAC” “pneumonic BAC” endobronchial spread
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Progressive consolidation over months especially if mass-like – consider lymphoma. middle aged, older – consider mucinous adeno ca.
Progressive consolidation over days/weeks consider Tb, resistant organism
Peripheral consolidation in patient with unusual clinical story and otherwise healthy consider OP and EP
Recurrent consolidation in same region abnormal underlying lung (obstruction, congenital)
Migratory consolidation consider OP, EP, aspiration, vasculitis
Daria Manos
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65 yo smoker: “abnormality on CXR”
Case 3: Question What is your recommendation?
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Case 3: What is your recommendation?
A. Follow up CT B. PET CT C. FNA or core D. Resection
Daria Manos
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When should the radiologist raise the possibility of infection
as a cause of SPN?
Daria Manos
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Consider infection as cause of SPN when:
1. Infectious history on original requisition.
81 yo one week of dsypnea
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Round pneumonia
Typical and atypical bugs Slowly fades away CT delayed resolution lobular pattern often satellite nodules
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Consider infection when:
2. Demographic clues:
Risk of infection immunocompromise smoker
< 50 years
exposure
> 60 years
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34 year old
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40 year old woman with fever and malaise
Blastomycosis Serology
core biopsy bronch VATS wedge.
Fungal infection Endemic in Ohio and Mississippi River valleys
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First 30 days post SCT – angioinvasive aspergillosis
Halo sign very specific but only in appropriate clinical context (severe neutropenia)
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35 yo male HIV + : tuberculosis
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Consider infection when:
3. Infectious CT features ground glass margin subsolid nodule/mass that has not been
proven persistent multifocal satellite nodules air bronchograms in a solid lesion Not present on recent CT
CT features alone only raise the possibility of infection. Neoplasm can not be excluded.
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Value of short interval follow up CT
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Role of FNA and PET?
When infection is more likely, the yield of FNA is lower.
When infection is a possibility, the specificity of PETCT is reduced.
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Textbook list of infectious causes of SPN
Round pneumonia Lung abscess Tb, NTMB Fungal
Coccidiomycosis Histoplasmosis Blastomycosis.
Cryptococcus Mycetoma Angioinvasive
aspergillosis Dog heartworm Echinococcus Nocardia
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Textbook list of infectious causes of SPN
Round pneumonia Lung abscess Tb, NTMB Fungal
Coccidiomycosis Histoplasmosis Blastomycosis.
Cryptococcus Mycetoma Angioinvasive
aspergillosis Dog heartworm Echinococcus Nocardia
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Textbook list of infectious causes of SPN
Round pneumonia Lung abscess Tb, NTMB Fungal
Coccidiomycosis Histoplasmosis Blastomycosis.
Cryptococcus Mycetoma Angioinvasive
aspergillosis Dog heartworm Echinococcus Nocardia
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Textbook list of infectious causes of SPN
Round pneumonia Lung abscess Tb, NTMB Fungal
Coccidiomycosis Histoplasmosis Blastomycosis.
Cryptococcus Mycetoma Angioinvasive
aspergillosis Dog heartworm Echinococcus Nocardia
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Textbook list of infectious causes of SPN
Round pneumonia Lung abscess Tb, NTMB Fungal
Coccidiomycosis Histoplasmosis Blastomycosis.
Cryptococcus Mycetoma Angioinvasive
aspergillosis Dog heartworm Echinococcus Nocardia
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Ruling out infectious cause of SPN
Step 1 – Is there infectious history? Step 2 – If no infectious history but
infectious CT features, do short interval follow up CT
Step 3 – If there is growth but still reasonable likelihood of infection, consider bronchoscopy or biopsy. Serology depending on risk factors (travel).
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Case 4:
Which micronodular pattern most likely represents infection?
Daria Manos
A B
C D
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Daria Manos
A
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Daria Manos
B
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Daria Manos
C
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Daria Manos
D
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Case 4: Answer
Which micronodular pattern most likely represents infection?
Daria Manos
A B
C D
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Tree in bud
Bronchiolar dilation and impaction Mucus, fluid, pus
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Secondary pulmonary lobule
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Centilobular core
Pulmonary artery Airway
Daria Manos
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Centrilobular Perilymphatic Random
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Textbook causes of Tree in bud
Daria Manos
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Acute bronchiolitis and Bronchopneumonia Majority of tree in bud is endobronchial infection. Bacterial, viral or fungal bronchopneumonia.
Practical causes of tree in bud
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Aspiration Practical causes of tree-in-bud
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Inpatient Elderly Post operative Vomiting or bowel obstruction New NG tube At risk ED patient Overdose Friday night trauma Vomiting or bowel obstruction t
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Non-tuberculosis Mycobacterial Practical causes of tree in bud
Daria Manos
Elderly women otherwise healthy Bronchiectasis – especially RML and lingula TIB - may be infection or bland mucous plugs Small nodules Waxes and wanes
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Non-tuberculosis Mycobacterial Practical causes of tree in bud
Daria Manos
Elderly women otherwise healthy Bronchiectasis – especially RML and lingula TIB - may be infection or bland mucous plugs Small nodules Waxes and wanes
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When does Tree in bud = TB?? If clinical suspicion of Tb: tree-in-bud is an early and strong marker of active disease. Consider Tb:
If cavitating focus. If evidence of prior disease. If risk factor. Appropriate clinical setting.
→ Precautions and Induced sputum.
Practical causes of tree in bud
Daria Manos
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Does HIV + TIB = TB
TIB in HIV often bacterial bronchiolitis / bronchopneumonia. Viral and bacterial TIB often basal predominant.
TIB in TB often asymmetric and more often both upper and lower lung involved.
Daria Manos
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Beware isolated TIB
Possible obstructing tumor Look for subtle central mass If no infectious symptoms/high risk - do bronch If unclear – follow up
Practical causes of tree in bud
Daria Manos
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? Active disease. Don’t overcall Practical causes of tree in bud
Daria Manos
Tree in bud can simply represent mucus impaction in bronchiectasis.
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Radiologic pattern of disease
Lobar pneumonia Bacteria, bacteria, bacteria. If immunocompromise – consider TB. If organ transplant – consider Nocardia.
Multifocal airspace Type and level of immunocompromise become more
important than radiologic pattern. Nodular – fungal, mycobacteria, nocardia more
likely. Interstitial or GGO – PCP + viral more likely
(especially in no effusion, no nodes)
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If you are just waking up:
ü History (type of immunocompromise and timing) may better predict specific infectious agent than CT appearance.
ü A dominant pattern of GGO in an immunocompromised patient is worrisome for opportunistic infection, including PCP.
ü Consider adenocarcinoma or lymphoma in air space consolidation progressing over months.
ü Tree-in-bud nodularity is often infection or aspiration.
ü When reporting a CT always review indication for the original CXR
*Heussel et al. AJR 1997;169:1347-1353.
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