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- •Contents
- •Preface
- •About the Editor
- •References
- •2. Eye, Posterior
- •Optical Coherence Tomography: Background and Principles
- •1. Eye, Anterior
- •Corneal Topography and Tomography
- •Ultrasound Biomicroscopy
- •Anterior Segment Optical Coherence Tomography
- •Confocal Microscopy
- •Specular Microscopy
- •Optical Coherence Tomography: Clinical Applications
- •Normal retinal anatomy
- •Retinal vascular disease: Diabetes, retinal vein, and artery occlusions
- •Choroidal disease: Age-related macular degeneration, myopic degeneration, and central serous chorioretinopathy (CSR)
- •Macular pucker and hole
- •Hereditary retinal dystrophies: Retinitis pigmentosa, Stargardt’s disease
- •Medication toxicity
- •Retinal detachment
- •Tumors (choroidal nevus, choroidal melanoma, and lymphoma)
- •References
- •3. Coronary Arteries
- •Introduction
- •Normal vessel wall, intimal thickening, and intimal xanthoma (fatty streak)
- •Pathological intimal thickening
- •Fibroatheroma
- •Ruptured plaques
- •Plaque erosion
- •Healed lesions
- •Imaging of Plaque Instability
- •Pathology of plaque instability
- •OCT imaging of plaque instability
- •Conclusion
- •References
- •4. Skin
- •Introduction
- •Optical Coherence Tomography (OCT)
- •Electrical Impedance Spectroscopy (EIS)
- •Future Directions
- •References
- •5. Upper Gastrointestinal Tract
- •Introduction
- •Esophagus
- •Stomach
- •Disclosures
- •References
- •6. Lower Gastrointestinal Tract
- •Introduction
- •Normal Microanatomy
- •Endoscopy
- •Confocal Laser Endomicroscopy
- •CLE of normal lower gastrointestinal tract
- •Limitations of CLE
- •Optical Coherence Tomography
- •Endocytoscopy
- •Enteropathy
- •Pouchitis
- •Celiac disease
- •Crohn’s disease
- •Ulcerative colitis
- •Pseudomembranous colitis
- •Intestinal spirochetosis
- •Microscopic colitis
- •Collagenous colitis
- •Lymphocytic colitis
- •Graft-versus-host disease (GVHD)
- •Neoplasia
- •Morphology
- •Molecular imaging
- •Computer-aided diagnosis (CAD)
- •References
- •7. Pancreaticobiliary System
- •Introduction
- •Pancreatic Cystic Lesions
- •EUS-nCLE image acquisition
- •Characteristics of in vivo microscopy of PCLs
- •Serous cystadenomas
- •Intraductal papillary mucinous neoplasm
- •Mucinous cystic neoplasms
- •Pseudocysts
- •Cystic neuroendocrine tumor
- •Squamous lined cysts (Lymphoepithelial cyst)
- •Differentiation of mucinous and non-mucinous PCLs
- •Future research in EUS-nCLE
- •Conclusion
- •Solid Pancreatic Lesions
- •Endomicroscopy characteristics of SPLs
- •Endomicroscopy of the Bile Duct
- •CLE image acquisition in the bile duct
- •Probe-based CLE patterns in biliary stenosis
- •Correlation of pCLE imaging of the bile duct with representative histology
- •Conclusion
- •References
- •8. Lungs
- •Introduction
- •Principle of optical imaging techniques
- •Role of ex vivo optical imaging techniques in lung cancer
- •FFOCT, MPM, and FCM can identify normal ex vivo lung tissue
- •FFOCT, MPM, and FCM can diagnose lung cancers in ex vivo tissue
- •In vivo application of optical imaging techniques in normal human lung and lung cancer
- •Conclusion
- •References
- •9. Breast
- •Introduction
- •Optical Mammography
- •Photoacoustic Imaging
- •Raman Spectroscopy
- •Future Directions
- •References
- •10. Central Nervous System
- •Introduction
- •Technique
- •Histopathology of Optical Images
- •Normal brain, dura, blood vessels, and blood
- •CNS Tumors
- •Artifacts
- •Limitations
- •Future Directions
- •Disclosures
- •Financial Support
- •Acknowledgments
- •Abbreviations
- •References
- •11. Head and Neck
- •Introduction
- •Applications
- •Diagnosis and evaluation
- •Surgical treatment
- •Current Limitations
- •Conclusion
- •References
- •12. Genitourinary System
- •Introduction
- •Bladder
- •Upper Urinary Tracts
- •Kidney
- •Prostate
- •Testis
- •Future Perspectives
- •References
- •13. Gynecologic Tract
- •Overview
- •IVM Applications in the Cervix
- •Optical spectroscopy and spectroscopic imaging
- •Spectroscopic imaging
- •Confocal microscopy
- •Optical coherence tomography
- •IVM detection of cervical neoplasia in resource-poor setting
- •Vulva
- •Histopathologic overview
- •IVM features of normal vulva
- •IVM features of vulvar pathology
- •Squamous dysplasia and carcinoma
- •Melanoma
- •Basal cell carcinoma
- •Extramammary Paget disease (EMPD)
- •Vagina
- •Histopathologic overview
- •IVM features of normal vagina
- •IVM features of vaginal pathology
- •Squamous dysplasia and carcinoma
- •Vaginal atrophy
- •Uterine Corpus
- •Ovary
- •Histopathologic overview
- •IVM features of normal ovary
- •IVM features of pathologic ovary
- •Fallopian Tube
- •Histopathologic overview
- •IVM features of normal fallopian tube
- •IVM features of pathologic fallopian tube
- •Peritoneum
- •Histopathologic overview
- •IVM features of normal peritoneum
- •IVM features of pathologic peritoneum
- •References
- •14. Hepatobiliary System
- •Introduction
- •Optical Coherence Tomography (OCT)
- •Conventional Confocal Microscopy and Confocal Endomicroscopy
- •Representative Human Confocal Laser Endomicroscopic Studies
- •Future Directions
- •Conclusion
- •References
- •15. Molecular Applications
- •References
- •Introduction
- •Intraoperative Evaluation of Surgical Margins
- •Applications in breast conservation surgery
- •Optical spectroscopy
- •Raman spectroscopy
- •Optical coherence tomography
- •Applications in Mohs micrographic surgery
- •Rapid lump examination
- •Confocal microscopy
- •Optical coherence tomography
- •Intraoperative Evaluation of Sentinel Lymph Nodes
- •Rapid Evaluation of Biopsy Adequacy
- •Conclusion
- •References
- •Index

150 S. G. Krishna
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pilot study for use in focal pancreatic masses. Pancreas, 44: 833–835 (2015).
29. Kongkam, P., Pittayanon, R., Sampatanukul, P., Angsuwatcharakon, P., Aniwan, S.,
Prueksapanich, P., et al. Endoscopic ultrasound-guided needle-based confocal laser
endomicroscopy for diagnosis of solid pancreatic lesions (ENES): A pilot study.
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© 2024 World Scientific Publishing Company
https://doi.org/10.1142/9789813206984_0008
Lungs Chapter
8
Manu Jain∗, Carolyn Glass†,
Nasser K. Altorki
Introduction
‡
, and Navneet Narula
§
Lung cancer is the most common cause of cancer-related mortality worldwide in both men and women. According to the American Cancer Society
annual report, it is estimated that in 2018 there would be 234,030 new cases
of lung cancer and 154,050 deaths in the United States.
of cases are due to long-term tobacco smoking but about 20% of cases occur
in never smokers. The 5-year survival for patients with non-small-cell lung
cancer (NSCLC) is dependent on stage: being 92% for Stage 1A and 10%
for stage IV.
∗
Department of Dermatology, Memorial Sloan Kettering Cancer Center, New York, NY,
USA.
†
Department of Pathology, Duke University Medical Center, Durham, NC, USA.
‡
Department of Thoracic Surgery, Weill Cornell Medical College, New York, NY, USA.
§
Department of Pathology, NYU School of Medicine, New York, NY, USA.
2
155
1
The vast majority

156 M. Jain
et al.
Chest radiography and computed tomography imaging a re initially
used to detect lung tumors, but definitive diagnosis requires pathologic
examinationusing hematoxylin and eosin (H&E)stained tissue withadjunct
immunohistochemical analysis. Here we discuss the use of alternative,
rapid optical imaging techniques that provide morphological details such as
full-fieldoptical coherence tomography (FFOCT), multiphotonmicroscopy
(MPM), and fluorescence confocal microscopy (FCM) for diagnosing neoplastic and possibly, non-neoplastic lung disease in ex vivo tissues.
3–5
We
will also briefly discuss the use of some of these aforementioned ex vivo
optical imaging techniques for in vivo imaging with focus on techniques
such as optical coherence tomography (OCT) and probe-based confocal
laser endomicroscopy (pCLE) that have been tested for real-time in vivo
imaging of lung in humans.
6–10
Principle of optical imaging techniques
The technical details of FFOCT, MPM, and FCM technology are detailed
in previous publications.
3–5,11, 12
Briefly, FFOCT is based on the principle
of white-light interference microscopy. When a biological tissue is placed
under the objective, the light reflected by the reference mirror interferes
with the light reflected or backscattered by the sample structures contained
in a limited volume. Interference only occurs when optical path lengths of
the two interferometer arms are identical, within ∼1 µm. Whereas, MPM
relies on the simultaneous absorption of 2 or 3 low-energy photons to cause
a nonlinear excitation, using 2-photon excitation in the 700–800 nm range
and second harmonic generation signal (SHG). FCM system uses a diode
laser and excites tissue at 488 nm wavelength, providing a lateral resolution
of 1.0 µm (cellular resolution images). The advantage of FCM over MPM
is the ability to image a large tissue piece (by a process of mosaicking) measuring approximately ∼1 cm within few seconds. However, unlike FFOCT
and MPM, FCM requires tissue staining using nuclear dye, such as acridine
orange.
FFOCT, MPM, and FCM enable ex vivo imaging of fresh, unprocessed, and unstained tissue at “near-histologic” resolution in real time.
Aptly, these emerging techniques are collectivelycalled as “optical-biopsy”
tools. When coupled withthoracoscopic technology,such techniques would

Lungs 157
allow in vivo visualization of suspicious lung lesions at cellular and subcellular levels. Accurately diagnosing the lesion in vivo in real time could
potentially allow resection of only the pathologic lesions, prevent unnecessary benign excisional biopsies and resections, reduce sampling error, and
ultimately minimize patient morbidity. In fact, there are two such promising real-time high-resolution imaging techniques that have been used for
in vivo imaging of human lungs: OCT and pCLE.
6–10
Both the techniques
use probes that can be inserted through the working channel of the bronchoscope into the airway for imaging. OCT uses near-infrared light to create
large field of view (FOV) cross-sectional images by the backscattering of
light from the tissue without the use of any exogenous dye or contrast
6–8
agent.
pCLE, on the other hand, uses the principle of fluorescence con-
focal microscopy where a fluorophore such as methylene blue is used for
9,10
the visualization of tissue.
The tissue is excited using 488 nm or 660 nm
laser light to create “quasi-histology” images with a lateral resolution of
3 microns, however, unlike OCT, the FOV of 600 microns is relatively
small.
Role of ex vivo optical imaging techniques in lung cancer
The ability to visualize fresh, unprocessedtissue at a “quasi-histologic” resolution potentially allows for these optical techniques during intraoperative
consultation as an alternative or adjunct to frozen section analysis. Lung
specimens can comprise a high percentage of intraoperative frozen section
consultations. Currently, frozen section analysis requires embedding tissue
in OCT medium, sectioning, and staining, which usually takes 10–20 min
before a diagnosis can be rendered to the surgeon.
13,14
Moreover, critical tissue can be lost during processing which may become problematic
in limited samples. Assessing parenchymal resection margins in real time
to confirm negative margins would potentially allow for more sublobar
resections. This would be especially valuable in patients with underlying
non-neoplastic lung disease with poor reserve. Because imaging data are
digital, they can be “streamed” to remote pathologists for expert consultation, without the pathologist being present at the procedure site. Furthermore, during biopsy procedure, these techniques can be used to improve

158 M. Jain
et al.
the yield of diagnostic tissue for histopathological evaluation, such as by
avoiding areas with fibrosis or necrosis and thus minimizing unnecessary
repeat biopsies at a later date.
The discovery of targetable driver mutations specifically in patients
with adenocarcinoma has led to additional procedures to obtain tumor tissue
for molecular testing.
15,16
It is thus critical in these cases, to be able to target
and thus biopsy in real time, only tumor tissue during the bronchoscopy or
other relevant procedures.
FFOCT, MPM, and FCM can identify normal ex vivo lung tissue
FFOCT, MPM, and FCM have recently been shown to identify normal
histology of a human lung in fresh ex vivo unprocessed and unstained tis-
3–5
sues.
The lung parenchyma (Figure 1(a, c)) appears as a lace-like structure composed of alveoli (dark signal-void areas) surrounded by bright pleura (connective tissue-bright signal). The bronchus (Figure 1(e)) appears as a dark
(signal-void) round to oval structure lined by columnar epithelium (gray
signal from cell cytoplasm and dark round nucleus) and can be differentiated from other dark round to oval structures such as blood vessels (Figure
1(c)) by a lack of epithelial lining in the latter.
fresh unprocessed ex vivo tissues. Images a through d show the characteristic lace-like pattern of lung parenchyma formed by alveoli, a long with
the surrounding pleura. In addition to FFOCT, MPM can further differentiate signals from collagen type I/III (SHG signal; color-coded red) and
elastin (autofluorescence signal; color-coded green). For example, elastin
component (autofluorescence signal; color-coded green) is prominent in
the alveolar septa (Figure 2(c)); whereas, the visceral pleura rich in collagen has mainly SHG signal (color-coded red) (Figure 2(a), inset). The
bronchus (Figure 2(e, h)) lined by ciliated columnar epithelium (autofluorescence signal from cell cytoplasm; color-coded green and dark nucleus)
with associated cartilage and a medium-sized blood vessel is also highlighted. Furthermore, various layers of a blood vessel (Figure 2(e, f)) can be
delineated with MPM. Medial smooth muscle layer with autofluorescence
Figure 1 shows various normal structures as they appearon FFOCT.
Figure 2 shows the normal architecture of a lung as seen on MPM in

Lungs 159
(a) (b)
(c) (d)
(e) (f)
Figure 1. Comparative full-field optical coherence tomography (FFOCT) and H&E images of nonneoplastic lung. (a, b) Large-field images show lung parenchyma composed of alveoli (signal void
areas; arrows) surrounded by pleura (connective tissue-bright signals; arrowheads). Some thickening
of the alveolar septa is shown (right arrow). (c, d) Images of blood vessels (arrowheads) and surrounding alveoli (arrows). (e, f) Images of a bronchus, with columnar epithelial lining (box and inset)
and underlying connective tissues (connective tissue-bright signal). (Scale bars for FFOCT: (a) 1 mm;
(c, e) 0.5mm. Inset in (e) 0.1 mm. H&E total magnifications: (b) × 40 and (d, f) × 200. Inset in (f) =×
2.5 zoom). Figure reproduced with permission, courtesy of the Journal of Pathology Informatics.
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