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Pathobasic
Non-neoplastic Lung Disease I
Pathology Spasenija Savic Prince
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Program
• Introduction to interstitial lung disease (ILD)/
diffuse parenchymal lung disease (DLD)
• Respiratory specimens
– Overview and handling
• Bronchoalveolar lavage (BAL)
– Indications
– Evaluation
• Examples
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ILD/DLD
• Spectrum of non-neoplastic inflammatory
conditions that share the common property of
diffuse involvement of the lung parenchyma
• Acute, subacute and chronic
• Idiopathic or non-idiopathic
– Most chronic ILD idiopathic (80%)
→ exclude known causes
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ATS/ERS, Am J Respir Crit Care Med., 2013/2002
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Multidisciplinary Discussion
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adapted from Raj R, Chest, 2016
Clinical context + CT pattern
Bronchoskopy: BAL, biopsy
Surgical lung biopsy
Multidisciplinary Discussion
Diagnosis, Treatment
non diagnostic
non diagnostic
UHB: 20%
TBB Cryo
BAL FACS
1mm
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Histological Specimens
• Fixation
– for microscopy and molecular analyses:
In 10% neutral buffered formalin
• gentle agitation helps to inflate TBB
– for electron microscopy (prim. ciliary dyskinesia):
In glutaraldehyde
• Microbiology
Leitlinien Makroskopie
http://sgpath.ch/qualitaetssicherung/
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Cytological Specimens
• Bronchial brushings, bronchial secretions,
(EBUS)-TBNA
– Smear preparation and immediate Fixation:
alcohol based (no formalin)
– Or send material in normal saline
• Bronchoalveolar lavage (BAL)
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BAL
• 3x50ml aliquots of
normal sterile saline
instilled and retrieved
• Sampling:
– DLD: Lingula
– Affected area
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BAL Request Form
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BAL Indications
• Infections
– immunocompromised patients
– persistent pulmonary infiltrates and inadequate
response to treatment
• ILD/DLD
– BAL diagnostic:
• Pulmonary histiocytosis, eosinophilic pneumonia
– BAL helpful:
• Sarkoidosis, HP/EAA, UIP…
• Tumors (lepidic pred. ADC)
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BAL
Microbiology
Culture Bacteria
Viruses
Fungi
weeks
PCR Bacteria
Viruses
Fungi
24-48h
Cytopathology
Cytomorphology MGG
PAP
Iron
1-2h
Fluorescence IF
Rhodamin-Auramin
Fungiqual A
1h
Suspected pulmonary infection
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Immunofluorescence
IIncubation with fluorescein
labeled antibody
Washing
Fluorescence microscopy
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Detection of Mikroorganisms
• Immunofluorescence: – Pneumocystis jirovecii
– CMV
– RSV
– Legionella Pneumophila
• Fluorescence stainings: – Auramin-Rhodamin: Acid-fast bacteria
– Fungiqual A: Fungi
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Pneumocystis jirovecii
• Nonfilamentous fungi – Colonization in hosts with intact immune system
– Lethal pneumonia in immunocompromised hosts
• Cannot be cultured
→ Goldstandard: Direct detection in BAL
• Three development forms – Trophocoit (1-5μm): Immunofluorescence
– Precyst (5-8μm)
– Cyst (~8μm): Conventional stains
→ Trophocoit forms 10x more frequent than cysts
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Stains used to detect P. jirovecii
MGG PAP
IF Grocott
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Detection of Pneumocystis jirovecii
test performance
Method Sensitivity (%) Specificity (%)
Conventional stains 40-80% 60-99%
Immunofluorescence 90-98% 94-100%
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CMV
• Latent infection – reactivation by immunosuppression
– reactivation (PCR, Kultur) ≠ CMV-disease
• Cytopathic effect – present in 10-20% of culture positive BAL
– good correlation with CMV pneumonia
• Detection rate doubled by use of monoclonal antibody techniques (IF): – positive results in 20-40% of culture positive BAL
– good correlation with CMV pneumonia
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Newly diagnosed HIV infection
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Double Infection
Pneumocystis jirovecii CMV
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Immunosuppressed patient under
chemotherapy
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Double Infection
Pneumocystis jirovecii CMV
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1. Colonisation
- Aspergilloma (single)
2. Allergic Aspergillosis
- Allergic bronchopulmonal Aspergillosis (ABPA)
- Hypersensitivity Pneumonitis
3. Invasive Aspergillosis
- Seminvasive: Granulomatous, multicystic
- Angioinvasive
• Hematolog. disease (after BM-transplantation: ~15%)
• Blood cultures typically negative, in der BAL ~50%
Pulmonary Aspergillosis
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• Ubiquatous mold
– Inhalation of the spores
• Filamentous fungus with charakteristic hyphae
– Uniform 3-6µm in width
– Parallel cell walls
– True septa at regular intervals
– Branching: 45°, regelular, dichotom
– DD: Fusarium, Scedosporium Spezies
→ mikrobiologic culture
Pulmonary Aspergillosis
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Fungiqual A
33y, BM-transplantated
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Zygomyces
Cave: Degenerative changes
→ Swollen hyphae
- Hyphae -15µm in width
- No parallel cell walls
- Cell walls often collapsed and drilled
Aspergillus
DD
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Pulmonary infections in
immunocompromied patients
• Often atypical clinical presentation
• Double infections common
• Rapid microorganism detection crucial
– IF in BAL
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Meyer KG et al. Am J Respir Cirt Care Med 2012
BAL
BAL in ILD/DLD
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Trypan blue (vital stain)
Neubauer hemocytometer (C-CHIP oneway)
L L
L L
Total Cell Count
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4x PAP Iron MGG Cytospins
ICC
IF
Cell diff.
(200 cells)
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CD4/CD8 ratio
• Normal range: 1-2
• Immunocytochemistry or
• FACS
Marker Lymphocytes
CD3 pan-T
CD4 T- helper
CD8 T- suppressor
CD19 B
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• <10 makrophages/HPF
• > ciliates / squamous cells
• degenerated cells
• 80-90% makrophages
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BAL Differential Cell Count:
Normal
% x106/L
Total cell count
Nonsmoker 50-100
Smoker -300
Makrophages
Nonsmoker >90 40-100
Smoker >90 100-300
Lymphocytes <10 <10
Neutrophils <10 <10
Eosinophils <0,5 <0,5
Mast cells 3/10HPF
Bubendorf L et. (2011) Pathologie. Zytopathologie; Springer-Verlag
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BAL Evaluation
• Cellular patterns
– neutrophilic, lymphocytic, eosinophilic
– mixed
– predominance of smoking-related Macrophages
• Alveolar macrophages
– iron
– foamy cell change
• Microorganisms
• Tumor cells
• Foreign material
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BAL as diagnostic tool in ILD/DLD
• Provides useful diagnostic information in patients with
suspected ILD/DLD when used in conjunction with
comprehensive clinical information and thoracic imaging
• Inflammatory cellular pattern helps to narrow the DD,
even though the patterns are nonspecific
• Can provide specific diagnosis
– infections, some DLDs, malignancies
Meyer KC et al .Am J Respir Crit Care Med 2012
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Patient 1
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Male with suspicion of sarcoidosis
• BAL
• TBNA mediastinal lymph node
• Bronchial biopsy
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BAL
Instilled fluid: 200 ml, retrieved fluid: 120 ml
CD4/CD8 ratio = 18.3
% x10^6/L
Total cell count 91.07
Makrophages 65 59.19
Lymphocytes 34 30.96
Neutrophils 1 0.91
Eosinophils 0
Mast cells 0
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M2069_Granulom_Sark
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Sarcoidosis
Diagnostic criteria
1. Compatible clinical and/or radiological picture
2. Demonstration of noncaseating granulomas
Biopsy (80%), TBNA (73%), EBUS (96%)
3. Exclusion of other diseases capable of producing
granulomas or a similar clinical picture
DD: infections (Tbc), HP, drug-induced, sarcoid-like reaction in
cancers and lymphomas, berylliosis
ATS, ERS and WASOG. Am J Respir Crit Care Med (160) 1999
Valeyre A et al. Lancet (383) 2014
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Sarcoidosis
BAL supports diagnosis
• Total cell count =/
• In 90%: Lympocytotis (20-50%)
– Even when imaging studies are normal
– DD: HP, NSIP, OP, drug reactions, infections, lymphoma
• Usually «claen» background:
– Normal neutrophiles, eosinophiles, mast cell counts
– No plasma cells and no foamy alvolar macrophages
Costabel U. et al. Semin Respir Crit Care Med (31) 2010
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Sarcoidosis
BAL supports diagnosis
• In 55%: CD4/CD8
– High variability
• In 15% <1.0
• >3.5 (normal range:1-2): • Spec. 93-96%, Sens. 53-59%, PPV 75-94%, NPV 71-85%
Costabel U. et al. Semin Respir Crit Care Med (31) 2010
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CD4/CD8
• Sarkoidosis
• Chronic HP/ EAA
• Infections (Tbc)
• Drugs - Methotrexat
- Ampicillin
- Nitrofurantoin
- Sirolimus
• Age
• Langerhans cell
histiocyrosis
• IPF
CD4/CD8
• HP
- EAA / drug induced
• OP
• Smoking
• AIDS
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Patient 2
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Female, lymphadenopathy, fever
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BAL
Instilled fluid: 150 ml, retrieved fluid: 60 ml
CD4/CD8 ratio = 7.6
% x10^6/L
Total cell count 39.8
Makrophages 31 12.3
Lymphocytes 64 25.4
Neutrophils 5 1.9
Eosinophils 0
Mast cells 0
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Auramin-Rhodamin
Mycobacteria
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Patient 3
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Male, Daptomycin (Cubicin®) for 5 weeks
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33% eosinphils
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Eosinophilic Pneumonia
• Daptomycin induced eosinophilic Pneumonia
• Eosinophilic pneumonie DD:
– Secondary • Infections (parasitic, fungal)
• Drug-induced
• Immunologic or systemic diseases
– Asthma, ABPA, CVD, Eos. granulomatosis with polyangitis, HIV
– Idiopathic
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Patient 4
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Female, caugh, mold exposure, EAA?
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BAL
Instilled fluid: 200 ml, retrieved fluid: 140 ml
% x10^6/L
Total cell count 770
Makrophages 75 577.5
Lymphocytes 11 84.7
Neutrophils 14 107.8
Eosinophils 0
Mast cells 0
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Predominance of Smoking-related
Macrophages
Smoking-realated ILD:
• RBILD
• Langerhans cell histiocytosis
• DIP
Meyer KC et al .Am J Respir Crit Care Med (9) 2012
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CD1a: > 5%
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Pulmonary
Langerhans Cell Histiocytosis
• >90% occur in smokers
• 20-50 years of age
• m=f
• 75% symptomatic – dry cough, dyspnoe, fever, weight loss, night sweats
– 10-20%: spontaneous pneumothorax
• Smoking cessation
• Few progress to lung fibrosis
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