Name: Video: Acquiring Anterior Segment High-Resolution Optical Coherence Tomography Images for Therapeutic Evaluation of Ocular Surface Squamous Neoplasia
Uploaded: 2024-08-09T14:40:00
Description: 119 Views. Acquiring Anterior Segment High-Resolution Optical Coherence Tomography Images for Therapeutic Evaluation of Ocular Surface Squamous Neoplasia

acquiring anterior segment high-resolution optical coherence tomography images for therapeutic evaluation of ocular surface squamous neoplasia

Evaluating Ocular Surface Squamous Neoplasia Using Anterior Segment HR-OCT

Ocular surface squamous neoplasia (OSSN) is the most common non-pigmented tumor of the conjunctiva and cornea. The term OSSN encompasses a broad spectrum of squamous neoplastic changes, including dysplasia (graded I-III), intraepithelial neoplasia (i.e., carcinoma in situ, CIS), and invasive squamous cell carcinoma (SCC)1. The diagnosis of OSSN can be made clinically by slit lamp examination by detecting the typical appearance of elevated, leukoplakic or papilliform mass, often presented at limbus straddling conjunctiva to the cornea with feeder vessels2. Sometimes, they may present less distinctively. The gold standard for the diagnosis of OSSN remains histopathologic confirmation followed by incisional or excisional biopsy1,3. 
Recently, the therapeutic pattern of OSSN has shifted from surgical management to the use of topical chemotherapy. This has greatly promoted the adoption of biopsy to less or non-invasive modalities4. Various imaging devices have been studied for the characterization of OSSN, namely HR-OCT, in vivo confocal microscopy (IVCM)5, impression cytology (IC)6, ultrasound biomicroscopy (UBM)7, and methylene blue stain4. Currently, several studies have provided insights into the characterization of OSSN using anterior segment HR-OCT. Commercially available HR-OCT devices using spectral-domain technology can attain an axial resolution of approximately 5 &#181;m. These images provide in vivo, cross-sectional views of ocular surface lesions and display distinct features of OSSN that parallel the changes seen in histopathology. Hence, HR-OCT enables clinicians to obtain an "optical biopsy" to expediently diagnose and monitor OSSN in clinics.
To promote the application of HR-OCT in the management of OSSN, a standardized, practical, and reproducible guidance for image acquisition is presented in detail to ensure good quality for clinical use. Also, characteristics of OSSN and other common benign lesions on HR-OCT are elucidated for better image interpretation.

Author Spotlight: Anterior HR-OCT as a Non-Invasive Tool for Characterizing Ocular Surface Squamous Neoplasia

Anterior High-Resolution Optical Coherence Tomography in the Diagnosis and Therapeutic Monitoring of Ocular Surface Squamous Neoplasia

Acquiring Anterior Segment High-Resolution Optical Coherence Tomography Images for Therapeutic Evaluation of Ocular Surface Squamous Neoplasia

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119 Views. Acquiring Anterior Segment High-Resolution Optical Coherence Tomography Images for Therapeutic Evaluation of Ocular Surface Squamous Neoplasia

Video: Acquiring Anterior Segment High-Resolution Optical Coherence Tomography Images for Therapeutic Evaluation of Ocular Surface Squamous Neoplasia

Ocular surface squamous neoplasia (OSSN) is the most common tumor of the ocular surface, ranging from mild dysplasia to invasive squamous carcinoma. Traditionally, the diagnosis of OSSN relies on histopathological confirmation followed by a full-thickness biopsy. However, in the past two decades, the therapeutic approach to OSSN has shifted from surgical intervention to topical chemotherapy regimens in clinical settings. This shift emphasizes the need for less invasive or non-invasive methods to diagnose ocular surface pathologies. Among various imaging devices, commercially available high-resolution optical coherence tomography (HR-OCT) has emerged as a powerful tool for the characterization of OSSN. HR-OCT provides an in vivo, cross-sectional view of ocular surface lesions, offering an "optical biopsy" for OSSN with high sensitivity and specificity. It provides valuable information in differentiating intraepithelial or invasive OSSN from other benign lesions. Additionally, HR-OCT can be used to monitor the response to topical chemotherapy and to detect subclinical OSSN during follow-up visits. In this article, the scanning protocol for image acquisition is presented, and image interpretation for OSSN is outlined. This standardized, practical, and reproducible approach is recommended in clinical workflows and is expected to assist clinicians in the management of OSSN.

Anterior segment high-resolution optical coherence tomography (HR-OCT) is a promising non-invasive modality for the diagnosis and therapeutic evaluation of ocular surface squamous neoplasia (OSSN). Here, the system setup, scanning technique, and representative diagnostic results are presented.

Ocular surface squamous neoplasia (OSSN) is the most common tumor of the ocular surface, ranging from mild dysplasia to invasive squamous carcinoma. ...