[Optical coherence tomography for early diagnosis of epithelial dysplasia and microinvasive carcinoma of the upper aerodigestive tract]. / Optische Kohärenztomographie zur Früherkennung epithelialer Dysplasien und mikroinvasiver Karzinome im oberen Luft-Speise-Weg.

BACKGROUND: Gold standard in the evaluation of upper aerodigestive tract (UADT) lesions is white light endoscopy followed by invasive tissue biopsy. This procedure is time consuming and expensive. Optical coherence tomography (OCT) is a noninvasive method, which provides high resolution, cross-sectional images of superficial tissue layers in real time. OBJECTIVE: This article aims to present a contemporary and comprehensive review on the role of OCT in differentiating between epithelial dysplasias and early invasive carcinomas of the UADT. MATERIALS AND METHODS: PubMed was searched using "optical coherence tomography/larynx" and other appropriate search strings in August 2015. RESULTS: OCT enables differentiation between benign, premalignant, and early malignant lesions of the UADT with high sensitivity and specificity. In addition, OCT holds promise as a clinical tool for guidance of surgical biopsies, follow-up of recurrent lesions, and for demarcation of tumor margins. Inadequate evidence and technical limitations hamper implementation of OCT into clinical routine. CONCLUSION: If the aforementioned problems are successfully solved, OCT seems to have the potential to substantially improve both diagnosis and management of precancerous and early cancerous lesions of the UADT.

[Optical diagnostic methods for early tumour diagnosis in the upper aerodigestive tract: Quo vadis?]. / Optische Diagnoseverfahren zur Tumorfrühdiagnostik im oberen Luft-Speise-Weg: Quo vadis?

BACKGROUND: Optical diagnostic methods may simplify and improve the early diagnosis of tumours of the upper aerodigestive tract; however, these have not yet found their way into clinical routine. OBJECTIVE: This article aims to define the problems that have prevented routine use of optical diagnostic methods so far, as well as listing and also explaining potential trendsetting approaches to overcome these difficulties. MATERIALS AND METHODS: The study is based on a combined analysis of publically accessible databases (PubMed MEDLINE, Thompson Reuters Web of Science, SPIE. Digital Library; full time period available; search strings: "oral cavity", "pharynx", "larnyx", "optical diagnosis", "optical biopsy", "optical coherence tomography", "confocal endomicroscopy", "fluorescence endoscopy", "narrow band imaging", "non-linear imaging", "fluorescence lifetime imaging"), as well as personal experiences. RESULTS: Both conceptual and methodical problems were determined, and possible solutions based on current developments are discussed. CONCLUSION: Optical diagnostic methods have the potential to revolutionise early diagnosis of upper aerodigestive tract malignancies, providing the different hurdles listed in this review can be overcome.