Abstract
Validation studies of whole slide imaging (WSI) systems produce evidence regarding digital microscopy (DM). This systematic review aimed to provide information about the performance of WSI devices by evaluating intraobserver agreement reported in previously published studies as the best evidence to elucidate whether DM is reliable for primary diagnostic purposes. In addition, this review delineates the reasons for the occurrence of discordant diagnoses. Scopus, MEDLINE/PubMed, and Embase were searched electronically. A total of 13 articles were included. The total sample of 2145 had a majority of 695 (32.4%) cases from dermatopathology, followed by 200 (9.3%) cases from gastrointestinal pathology. Intraobserver agreements showed an excellent concordance, with values ranging from 87% to 98.3% (κ coefficient range 0.8–0.98). Ten studies (77%) reported a total of 128 disagreements. The remaining three studies (23%) did not report the exact number and nature of disagreements. Borderline/challenging cases were the most frequently reported reason for disagreements (53.8%). Six authors reported limitations of the equipment and/or limited image resolution as reasons for the discordant diagnoses. Within these articles, the reported pitfalls were as follows: difficulties in the identification of eosinophilic granular bodies in brain biopsies; eosinophils and nucleated red blood cells; and mitotic figures, nuclear details, and chromatin patterns in neuropathology specimens. The lack of image clarity was reported to be associated with difficulties in the identification of microorganisms (e.g., Candida albicans, Helicobacter pylori, and Giardia lamblia). However, authors stated that the intraobserver variances do not derive from technical limitations of WSI. A lack of clinical information was reported by four authors as a source for disagreements. Two studies (15.4%) reported poor quality of the biopsies, specifically small size of the biopsy material or inadequate routine laboratory processes as reasons for disagreements. One author (7.7%) indicated the lack of immunohistochemistry and special stains as a source for discordance. Furthermore, nine studies (69.2%) did not consider the performance of the digital method—limitations of the equipment, insufficient magnification/limited image resolution—as reasons for disagreements. To summarize the pitfalls of digital pathology practice and better address the root cause of the diagnostic discordance, we suggest a Categorization for Digital Pathology Discrepancies to be used in further validations studies. Among 99 discordances, only 37 (37.3%) had preferred diagnosis rendered by means of WSI. The risk of bias and applicability concerns were judged with the QUADAS-2. Two studies (15.4%) presented an unclear risk of bias in the sample selection domain and 2 (15.4%) presented a high risk of bias in the index test domain. Regarding applicability, all studies included were classified as a low concern in all domains. The included studies were optimally designed to validate WSI for general clinical use, providing evidence with confidence. In general, this systematic review showed a high concordance between diagnoses achieved by using WSI and conventional light microscope (CLM), summarizes difficulties related to specific findings of certain areas of pathology—including dermatopathology, pediatric pathology, neuropathology, and gastrointestinal pathology—and demonstrated that WSI can be used to render primary diagnoses in several subspecialties of human pathology.
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References
Pantanowitz L, Sinard JH, Henricks WH, Fatheree LA, Carter AB, Contis L, Beckwith BA, Evans AJ, Lal A, Parwani AV, College of American Pathologists Pathology and Laboratory Quality Center (2013) Validating whole slide imaging for diagnostic purposes in pathology: guideline from the College of American Pathologists Pathology and Laboratory Quality Center. Arch Pathol Lab Med 137:1710–1722. https://doi.org/10.5858/arpa.2013-0093-CP
Pantanowitz L, Evans A, Pfeifer J, Collins LC, Valenstein PN, Kaplan KJ, Wilbur DC, Colgan TJ (2011) Review of the current state of whole slide imaging in pathology. J Pathol Inform 2:36. https://doi.org/10.4103/2153-3539.83746
Koch LH, Lampros JN, Delong LK, Chen SC, Woosley JT, Hood AF (2009) Randomized comparison of virtual microscopy and traditional glass microscopy in diagnostic accuracy among dermatology and pathology residents. Hum Pathol 40:662–667. https://doi.org/10.1016/j.humpath.2008.10.009
Whiting P, Harbord R, Kleijnen J (2005) No role for quality scores in systematic reviews of diagnostic accuracy studies. BMC Med Res Methodol 5:19. https://doi.org/10.1186/1471-2288-5-19
Cornish TC, Swapp RE, Kaplan KJ (2012) Whole-slide imaging: routine pathologic diagnosis. Adv Anat Pathol 19:152–159. https://doi.org/10.1097/PAP.0b013e318253459e
Food and Drug Administration (2017) FDA allows marketing of first whole slide imaging system for digital pathology. https://www.fda.gov/newsevents/newsroom/pressannouncements/ucm552742.htm. Accessed 16 Mar 2017
Moher D, Liberati A, Tetzlaff J, Altman DG (2009) Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement. PLoS Med 6:e1000097. https://doi.org/10.1371/journal.pmed.1000097
Williams BJ, Hanby A, Millican-Slater R, Nijhawan A, Verghese E, Treanor D (2018) Digital pathology for the primary diagnosis of breast histopathological specimens: an innovative validation and concordance study on digital pathology validation and training. Histopathology 72:662–671. https://doi.org/10.1111/his.13403
Goacher E, Randell R, Williams B, Treanor D (2017) The diagnostic concordance of whole slide imaging and light microscopy: a systematic review. Arch Pathol Lab Med 141:151–161. https://doi.org/10.5858/arpa.2016-0025-RA
Ouzzani M, Hammady H, Fedorowicz Z, Elmagarmid A (2016) Rayyan—a web and mobile app for systematic reviews. Syst Rev 5:210. https://doi.org/10.1186/s13643-016-0384-4
Cochrane Effective Practice and Organisation of Care (EPOC) (2017). EPOC Resources for review authors. https://epoc.cochrane.org/resources/epoc-resources-review-authors
Nielsen PS, Lindebjerg J, Rasmussen J, Starklint H, Waldstrøm M, Nielsen B (2010) Virtual microscopy: an evaluation of its validity and diagnostic performance in routine histologic diagnosis of skin tumors. Hum Pathol 41:1770–1776. https://doi.org/10.1016/j.humpath.2010.05.015
Al-Janabi S, Huisman A, Vink A et al (2012) Whole slide images for primary diagnostics in dermatopathology: a feasibility study. J Clin Pathol 65:152–158. https://doi.org/10.1136/jclinpath-2011-200277
Al-Janabi S, Huisman A, Vink A et al (2012) Whole slide images for primary diagnostics of gastrointestinal tract pathology: a feasibility study. Hum Pathol 43:702–707. https://doi.org/10.1016/j.humpath.2011.06.017
Al-Janabi S, Huisman A, Willems SM, Van Diest PJ (2012) Digital slide images for primary diagnostics in breast pathology: a feasibility study. Hum Pathol 43:2318–2325. https://doi.org/10.1016/j.humpath.2012.03.027
Al-Janabi S, Huisman A, Nikkels PGJ et al (2013) Whole slide images for primary diagnostics of paediatric pathology specimens: a feasibility study. J Clin Pathol 66:218–223. https://doi.org/10.1136/jclinpath-2012-201104
Al-Janabi S, Huisman A, Jonges GN et al (2014) Whole slide images for primary diagnostics of urinary system pathology: a feasibility study. J Ren Inj Prev 3:91–96. https://doi.org/10.12861/jrip.2014.26
Arnold MA, Chenever E, Baker PB, Boué DR, Fung B, Hammond S, Hendrickson BW, Kahwash SB, Pierson CR, Prasad V, Nicol KK, Barr T (2015) The College of American Pathologists Guidelines for whole slide imaging validation are feasible for pediatric pathology: a pediatric pathology practice experience. Pediatr Dev Pathol 18:109–116. https://doi.org/10.2350/14-07-1523-OA.1
Kent MN, Olsen TG, Feeser TA, Tesno KC, Moad JC, Conroy MP, Kendrick MJ, Stephenson SR, Murchland MR, Khan AU, Peacock EA, Brumfiel A, Bottomley MA (2017) Diagnostic accuracy of virtual pathology vs traditional microscopy in a large dermatopathology study. JAMA Dermatol 153:1285–1291. https://doi.org/10.1001/jamadermatol.2017.3284
Loughrey MB, Kelly PJ, Houghton OP, Coleman HG, Houghton JP, Carson A, Salto-Tellez M, Hamilton PW (2015) Digital slide viewing for primary reporting in gastrointestinal pathology: a validation study. Virchows Arch 467:137–144. https://doi.org/10.1007/s00428-015-1780-1
Pekmezci M, Uysal SP, Orhan Y et al (2016) Pitfalls in the use of whole slide imaging for the diagnosis of central nervous system tumors: a pilot study in surgical neuropathology. J Pathol Inform 7:25. https://doi.org/10.4103/2153-3539.181769
Saco A, Diaz A, Hernandez M, Martinez D, Montironi C, Castillo P, Rakislova N, del Pino M, Martinez A, Ordi J (2017) Validation of whole-slide imaging in the primary diagnosis of liver biopsies in a university hospital. Dig Liver Dis 49:1240–1246. https://doi.org/10.1016/j.dld.2017.07.002
Tabata K, Mori I, Sasaki T, Itoh T, Shiraishi T, Yoshimi N, Maeda I, Harada O, Taniyama K, Taniyama D, Watanabe M, Mikami Y, Sato S, Kashima Y, Fujimura S, Fukuoka J (2017) Whole-slide imaging at primary pathological diagnosis: validation of whole-slide imaging-based primary pathological diagnosis at twelve Japanese academic institutes. Pathol Int 67:547–554. https://doi.org/10.1111/pin.12590
Thrall MJ, Wimmer JL, Schwartz MR (2015) Validation of multiple whole slide imaging scanners based on the guideline from the College of American Pathologists pathology and laboratory quality center. Arch Pathol Lab Med 139:656–664. https://doi.org/10.5858/arpa.2014-0073-OA
Camparo P, Ramirez A, Claude V et al (2009) Whole slide imaging in daily routine examination in a pathologic department: Experience of a military hospital network in Paris. Rev Fr Lab 38:49–55 RFL-01-2008-38-408-1773-035x-101019-200812623
Wang M, Liu S, Xie C et al (2015) Making primary diagnosis on liver allograft biopsies with whole slide images - a validation study. Am J Clin Pathol 144:A168. https://doi.org/10.1093/ajcp/144.suppl2.168
Gage JC, Joste N, Ronnett BM, Stoler M, Hunt WC, Schiffman M, Wheeler CM (2013) A comparison of cervical histopathology variability using whole slide digitized images versus glass slides: experience with a statewide registry. Hum Pathol 44:2542–2548. https://doi.org/10.1016/j.humpath.2013.06.015
Zeitouni J, Jorda M, Reyes C, Nadji M (2012) Validation of whole slide imaging for the first line diagnosis of prostate biopsies. Lab Invest 92:519A–520A. https://doi.org/10.1038/labinvest.2012.24
Gerhard R, Honorio A, Gentili A et al (2014) Primary histopathological diagnosis using whole slide imaging (WSI): a validation study. Lab Invest 94:399A. https://doi.org/10.1038/labinvest.2014.28
Goodman S, Kandil D, Khan (2014) A Diagnosis of breast needle core biopsies using whole slide imaging. Lab Invest 94:399A. https://doi.org/10.1038/labinvest.2014.28
Parimi V, Borys A, Zhou Y et al (2016) Validation of whole frozen section slide image diagnosis in surgical pathology. Lab Invest 96:399A–400A. https://doi.org/10.1038/labinvest.2016.15
Bradshaw S, Driman D, Dupre M et al (2013) Inter- and intra-observer agreement in diagnosing dysplasia in Barrett’s esophagus: comparison of routine glass slide vs. digital image examination. Lab Investig 93:471–489. https://doi.org/10.1038/labinvest.2013.36
Sturm B, Fleskens S, Bot F et al (2013) Larynx virtual microscopy validation study. Virchows Arch 463:109–352. https://doi.org/10.1007/s00428-013-1444-y
Sturm B, Mooi W, Creytens D et al (2017) Validation of diagnosing melanocytic lesions on whole slide images- does z-stack scanning improve diagnostic accuracy? Virchows Arch 471:S15. https://doi.org/10.1007/s00428-013-1444-y
Maleeff BE (2014) Validation of a digital pathology whole slide imaging system. Microsc Microanal 20:1410–1411. https://doi.org/10.1017/S1431927614008782
Eccher A, Calio A, Colombari R et al (2015) Validation of digital whole slide imaging according to the College of American Pathologists Guidelines in the evaluation of pre-implant kidney biopsies. Lab Investig 95:499A. https://doi.org/10.1038/labinvest.2015.25
Hoffmann J, McGinnis L, Mafnas CT et al (2016) Validation of digital whole slide imaging system for intraoperative breast sentinel lymph node touch prep analysis: a single institution experience. Lab Investig 96:391–402. https://doi.org/10.1177/20101058110200S101
Wilson I, Treanor D, Williams B (2017) Belfast Pathology 2017. 10th joint meeting of the British division of the international academy of pathology and the pathological Society of Great Britain & Ireland, 20-23 June 2017. J Pathol 243:S1–S41. https://doi.org/10.1002/path.4984
Randell R, Ruddle RA, Mello-Thoms C, Thomas RG, Quirke P, Treanor D (2013) Virtual reality microscope versus conventional microscope regarding time to diagnosis: An experimental study. Histopathology 62:351–358. https://doi.org/10.1111/j.1365-2559.2012.04323.x
Lee JJ, Jedrych J, Pantanowitz L (2017) Validation of digital pathology for primary histopathological diagnosis of routine, inflammatory dermatopathology cases 0:1–7. https://doi.org/10.1097/DAD.0000000000000888
Rodriguez-Urrego PA, Cronin AM, Al-Ahmadie HA et al (2011) Interobserver and intraobserver reproducibility in digital and routine microscopic assessment of prostate needle biopsies. Hum Pathol 42:68–74. https://doi.org/10.1016/j.humpath.2010.07.001
Jara-Lazaro AR, Tan PH (2012) Comparing digital and optical microscopy diagnoses of breast and prostate core biopsies. Pathology 44:46–48. https://doi.org/10.1097/PAT.0b013e32834e4254
Krishnamurthy S, Mathews K, McClure S, Murray M, Gilcrease M, Albarracin C, Spinosa J, Chang B, Ho J, Holt J, Cohen A, Giri D, Garg K, Bassett RL Jr, Liang K (2013) Multi-institutional comparison of whole slide digital imaging and optical microscopy for interpretation of hematoxylin-eosin-stained breast tissue sections. Arch Pathol Lab Med 137:1733–1739. https://doi.org/10.5858/arpa.2012-0437-OA
Campbell W, Lele S, West W et al (2012) Diagnoses rendered by whole slide imaging (WSI) alone are accurate for use in a general surgical pathology practice. Lab Investig 92:494–509. https://doi.org/10.1038/labinvest.2012.23
Campbell WS, Lele SM, West WW, Lazenby AJ, Smith LM, Hinrichs SH (2012) Concordance between whole-slide imaging and light microscopy for routine surgical pathology. Hum Pathol 43:1739–1744. https://doi.org/10.1016/j.humpath.2011.12.023
Campbell WS, Hinrichs SH, Lele SM, Baker JJ, Lazenby AJ, Talmon GA, Smith LM, West WW (2014) Whole slide imaging diagnostic concordance with light microscopy for breast needle biopsies. Hum Pathol 45:1713–1721. https://doi.org/10.1016/j.humpath.2014.04.007
Brunelli M, Beccari S, Colombari R et al (2014) iPathology cockpit diagnostic station: validation according to College of American Pathologists Pathology and Laboratory Quality Center recommendation at the hospital trust and University of Verona. Diagn Pathol 9(Suppl 1):S12. https://doi.org/10.1186/1746-1596-9-S1-S12
Ordi J, Castillo P, Saco A, del Pino M, Ordi O, Rodríguez-Carunchio L, Ramírez J (2015) Validation of whole slide imaging in the primary diagnosis of gynaecological pathology in a university hospital. J Clin Pathol 68:33–39. https://doi.org/10.1136/jclinpath-2014-202524
Snead DRJ, Tsang YW, Meskiri A, Kimani PK, Crossman R, Rajpoot NM, Blessing E, Chen K, Gopalakrishnan K, Matthews P, Momtahan N, Read-Jones S, Sah S, Simmons E, Sinha B, Suortamo S, Yeo Y, el Daly H, Cree IA (2016) Validation of digital pathology imaging for primary histopathological diagnosis. Histopathology 68:1063–1072. https://doi.org/10.1111/his.12879
Fónyad L, Krenács T, Nagy P, Zalatnai A, Csomor J, Sápi Z, Pápay J, Schönléber J, Diczházi C, Molnár B (2012) Validation of diagnostic accuracy using digital slides in routine histopathology. Diagn Pathol 7:35. https://doi.org/10.1186/1746-1596-7-35
Shah KK, Lehman JS, Gibson LE, Lohse CM, Comfere NI, Wieland CN (2016) Validation of diagnostic accuracy with whole-slide imaging compared with glass slide review in dermatopathology. J Am Acad Dermatol 75:1229–1237. https://doi.org/10.1016/j.jaad.2016.08.024
Elmore J, Longton G, Pepe M et al (2017) A randomized study comparing digital imaging to traditional glass slide microscopy for breast biopsy and cancer diagnosis. J Pathol Inform 8:12. https://doi.org/10.4103/2153-3539.201920
Mills AM, Gradecki SE, Horton BJ et al (2018) Diagnostic Efficiency in Digital Pathology: A Comparison of Optical Versus Digital Assessment in 510 Surgical Pathology Cases. Am J Surg Pathol. 42(1):53–59. https://doi.org/10.1097/PAS.0000000000000930
Foad AFA (2017) Comparing the use of virtual and conventional light microscopy in practical sessions: virtual reality in Tabuk University. J Taibah Univ Med Sci 12:183–186. https://doi.org/10.1016/j.jtumed.2016.10.015
Bauer TW, Schoenfield L, Slaw RJ, Yerian L, Sun Z, Henricks WH (2013) Validation of whole slide imaging for primary diagnosis in surgical pathology. Arch Pathol Lab Med 137:518–524. https://doi.org/10.5858/arpa.2011-0678-OA
Buck T, Dilorio R, Havrilla L, O′Neill D (2014) Validation of a whole slide imaging system for primary diagnosis in surgical pathology: a community hospital experience. J Pathol Inform 5:43. https://doi.org/10.4103/2153-3539.145731
Bauer TW, Slaw RJ (2014) Validating whole-slide imaging for consultation diagnoses in surgical pathology. Arch Pathol Lab Med 138:1459–1465. https://doi.org/10.5858/arpa.2013-0541-OA
Mukhopadhyay S, Feldman MD, Abels E, Ashfaq R, Beltaifa S, Cacciabeve NG, Cathro HP, Cheng L, Cooper K, Dickey GE, Gill RM, Heaton RP Jr, Kerstens R, Lindberg GM, Malhotra RK, Mandell JW, Manlucu ED, Mills AM, Mills SE, Moskaluk CA, Nelis M, Patil DT, Przybycin CG, Reynolds JP, Rubin BP, Saboorian MH, Salicru M, Samols MA, Sturgis CD, Turner KO, Wick MR, Yoon JY, Zhao P, Taylor CR (2017) Whole slide imaging versus microscopy for primary diagnosis in surgical pathology. Am J Surg Pathol 42:1. https://doi.org/10.1097/PAS.0000000000000948
Williams BJ, DaCosta P, Goacher E, Treanor D (2017) A systematic analysis of discordant diagnoses in digital pathology compared with light microscopy. Arch Pathol Lab Med 141:1712–1718. https://doi.org/10.5858/arpa.2016-0494-OA
Cornish TC, Swapp RE, Kaplan KJ (2012) Whole-slide Imaging. Adv Anat Pathol 19:152–159. https://doi.org/10.1097/PAP.0b013e318253459e
Saco A, Ramírez J, Rakislova N, Mira A, Ordi J (2016) Validation of whole-slide imaging for Histolopathogical diagnosis: current state. Pathobiology 83:89–98. https://doi.org/10.1159/000442823
Araújo ALD, Amaral-Silva GK, Fonseca FP, Palmier NR, Lopes MA, Speight PM, de Almeida OP, Vargas PA, Santos-Silva AR (2018) Validation of digital microscopy in the histopathological diagnoses of oral diseases. Virchows Arch 473:321–327. https://doi.org/10.1007/s00428-018-2382-5
Sanders DSA, Grabsch H, Harrison R, Bateman A, Going J, Goldin R, Mapstone N, Novelli M, Walker MM, Jankowski J, on behalf of the AspECT trial management group and trial principal investigators (2012) Comparing virtual with conventional microscopy for the consensus diagnosis of Barrett’s neoplasia in the AspECT Barrett’s chemoprevention trial pathology audit. Histopathology 61:795–800. https://doi.org/10.1111/j.1365-2559.2012.04288.x
Romero Lauro G, Cable W, Lesniak A, Tseytlin E, McHugh J, Parwani A, Pantanowitz L (2013) Digital pathology consultations - a new era in digital imaging, challenges and practical applications. J Digit Imaging 26:668–677. https://doi.org/10.1007/s10278-013-9572-0
Boyce BF (2015) Whole slide imaging: uses and limitations for surgical pathology and teaching. Biotech Histochem 90:321–330. https://doi.org/10.3109/10520295.2015.1033463
Vodovnik A (2016) Diagnostic time in digital pathology: a comparative study on 400 cases. J Pathol Inform 7:4. https://doi.org/10.4103/2153-3539.175377
Fernandes C, Bonan R, Bonan P et al (2018) Dental Students’ Perceptions and Performance in Use of Conventional and Virtual Microscopy in Oral Pathology. J Dent Educ 82:883–890. https://doi.org/10.21815/JDE.018.084
Fallon MA, Wilbur DC, Prasad M (2010) Ovarian frozen section diagnosis: use of whole-slide imaging shows excellent correlation between virtual slide and original interpretations in a large series of cases. Arch Pathol Lab Med 134:1020–1023. https://doi.org/10.1043/2009-0320-OA.1
Särndal C-E (2003) Stratified sampling. In: Model Assisted Survey Sampling. Springer, pp 100–109
Leeflang MMG, Moons KGM, Reitsma JB, Zwinderman AH (2008) Bias in sensitivity and specificity caused by data-driven selection of optimal cutoff values: mechanisms, magnitude, and solutions. Clin Chem 54:729–737. https://doi.org/10.1373/clinchem.2007.096032
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Financial support was received from the Coordination for the Improvement of Higher Education Personnel (CAPES/PROEX, Brazil), the National Council for Scientific and Technological Development (CNPq, Brazil) and the grants from São Paulo Research Foundation (FAPESP, Brazil) process number: 2009/53839-2.
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All authors had substantial contributions to the conception, draft and design of this work, (Anna Luíza Damaceno Araújo, Natália Rangel Palmier, Cristhian Camilo Troconis, Paul M. Speight, Oslei Paes de Almeida, Marcio Ajudarte Lopes and Alan Roger Santos-Silva), as well as participation of the acquisition (Lady Paola Aristizábal Arboleda, Natália Rangel Palmier, Jéssica Montenegro Fonsêca, Mariana de Pauli Paglioni, Ana Carolina Prado Ribeiro, Pablo Agustin Vargas, Luciana Estevam Simonato and Wagner Gomes-Silva), analysis (Anna Luíza Damaceno Araújo, Felipe Paiva Fonseca and Lady Paola Aristizábal Arboleda), and interpretation (Anna Luíza Damaceno Araújo, Cristhian Camilo Troconis, Thaís Bianca Brandão and Alan Roger Santos-Silva) of data for the work. The final version of this work was reviewed and approved for publication by all parts included. Authors Anna Luíza Damaceno Araújo and Alan Roger Santos-Silva takes full responsibility for the work as a whole, including the study design, access to data and the decision to submit and publish the manuscript.
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Araújo, A.L.D., Arboleda, L.P.A., Palmier, N.R. et al. The performance of digital microscopy for primary diagnosis in human pathology: a systematic review. Virchows Arch 474, 269–287 (2019). https://doi.org/10.1007/s00428-018-02519-z
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DOI: https://doi.org/10.1007/s00428-018-02519-z