Innovative modification of the USB dermatoscope for mucoscopy

Development of an intraoral handheld optical coherence tomography-based angiography probe for multi-site oral imaging

Oral cancer, primarily oral squamous cell carcinomas (OSCC), is a major health concern worldwide. The current gold standard for the diagnosis of OSCC is biopsy and histopathological analysis, which is invasive and can place a huge financial burden on the healthcare system. Optical coherence tomography-based angiography (OCTA) is a non-invasive imaging technique that shows promise as an imaging modality to aid the diagnosis of OSCC. This Letter outlines the development of a handheld intraoral OCT probe applied to a swept-source OCT system with an angiography function for oral applications. The probe has a thin body with a diameter of 17.8 mm and a two-lens system with a working distance that is adjustable from 20.92 mm to 24.08 mm, a field of view 9 mm in diameter, an imaging depth of ∼1.7 mm, and resolutions of 39.38 µm (laterally) and 33.37 µm (axially). This probe was used to scan 14 oral sites to evaluate its ability to scan various sites in the oral cavity. This system has the potential to reduce invasive procedures and aid early OSCC diagnosis.

What Do the Lips Say in Chronic Graft-Versus-Host Disease After Allogeneic Hematopoietic Stem Cell Transplantation? A Case Series

Introduction

Chronic graft-versus-host disease (cGvHD) affects around half of allogeneic hematopoietic stem cell transplantation (alloHSCT) recipients, with frequent involvement of the oral mucosa and lip vermillion, that clinically may resemble other autoimmune and inflammatory conditions. Our objectives were to define the dermoscopic patterns of lip vermilion in patients suffering from cGvHD and to compare the presentation with previously published dermoscopic presentations of other disease entities presenting on the lip vermillion.

Methods

A group of 16 patients diagnosed with cGvHD was assessed clinically and dermoscopically. The dermoscopic descriptions were made according to recent consensus on terminology of non-neoplastic disorders.

Results

Dermoscopy of vermillion frequently revealed dotted vessels that were found in all patients, while linear vessels without bends or branches were seen in 10 of them (62.5%). Peripheral scale, mainly in white color (13/16, 81.2%) was often present. Most striking features were parallel and perpendicular white lines, found in all patients. Other structures included brown dots and blood spots that were present in 10 patients (62.5%). Four patients (25.0%) had blurred vermillion border and in 8 (50.0%) linear fissures or ulceration were found. Typical Wickham striae were found in 3 (18.8%) patients.

Conclusions

The dermoscopic features observed in cGvHD affecting lip vermillion warrant differentiation with inflammatory (lichen planus), autoimmune (lichen sclerosus, discoid lupus erythematosus), precancerous (actinic keratosis, leukoplakia), and neoplastic diseases (squamous cell carcinoma), among others. Dermoscopy of lip vermillion might be an additional tool to visualize diagnostic mucoscopic features of cGvHD (lichen planus-like, lichen sclerosus-like lesions).

The new kid on the block in physical diagnosis? Introducing digital microscopy

Emerging microprocessor technology has revolutionized all aspects of life in the modern era. Feats previously achieved through sophisticated, cumbersome and expensive devices are currently both commonplace and feasible with convenient instruments available at low-cost. Body surface inspection can prove very challenging when seeking minute alterations of anatomy and miniature inflicting culprits. USB (universal serial bus) dermatoscopy (UD) is the most economical and widespread technique widely utilized in industry and even lay use but inadeqautely addressed in the field of medicine. This manuscript provides a preliminary exposure of UD to those unfamiliar with this technique and demonstrates its merits improving patient care. UD constitutes an ideal method to magnify, up to over 100 fold, minute detail and project images on a screen of choice, be it a laptop, tablet or standard smartphone. Clinical practice, especially in rural areas, has much to gain from a device that can expose illusive clinical detail that is imperceptible by the naked eye. The basis of the technique is described and genuine cases where it was utilized are shared. Personal experience with this technique demonstrates that employing ample magnification and thorough illumination facilitates reaching the correct diagnosis whenever physical examination of the superficial body surface is necessary. Body regions amenable for improved visualization with this method extend from scalp hair, skin and ocular structures, all the way to the anal sphincter. The objective of this paper is to familiarize physicians with the advantages of digital microscopy through numerous clinical illustrations, as: characterization and surveillance of lesions, sores, cutaneous and corneal foreign bodies, painful conditions of the nipple, hematomas retained sutures, secretions and purulent lesions. This introduction is hoped to arouse enthusiasm towards digital microscopy and encourage its adoption into routine practice.

Non-invasive intravital observation of lingual surface features using sliding oral mucoscopy techniques in clinically healthy subjects

To investigate intravital morphological features of the broader area of the lingual mucosa in clinically healthy subjects, and to attempt to evaluate subclinical conditions, we evaluated detailed intravital morphological features of the lingual mucosa using our newly developed oral contact mucoscopy techniques. Clinically healthy subjects (female: 19-22 years, average age: 20.27 years, and n = 28) were enrolled. A position indicator stain was placed on the lingual mucosal surface, and sliding images were captured and then reconstructed. In addition, the lingual mucosa was divided into six areas, and morphometry of the fungiform and filiform papillae was performed. The results were statistically analyzed. There were two morphological features among clinically healthy subjects involving the filiform papillae: the length of the papillae and the degree of biofilm (tongue coat) deposition. We defined a modified tongue coat index (mTCI) with scores ranging from 0 (tongue coating not visible) to 0.5, 1, 1.5, and 2 (thick tongue coating) for six sections of the tongue dorsum. No subjects received a score of 2. Significant differences were found in the mTCI between the six sections of the tongue dorsum, especially between the posterior areas and the lingual apex. The fungiform papillae of some subjects exhibited elongated morphological changes. Our findings suggest that magnified lingual dorsum examination of a broader area is especially important in accurate screening for subclinical or transient conditions of potential lingual mucosal diseases. For this purpose, our new oral mucoscopy and non-invasive intravital observational techniques were especially effective.

Dermatoscopy of nonvenereal genital dermatoses: A brief review

The scope of dermatoscopy has now vastly expanded and shows promising use for characterization of both pigmentary and inflammatory dermatoses affecting the skin, nail, and mucosae. Due to concerns of contamination and spread of infection, dermatoscopy has not been widely studied for genital mucosal dermatoses. In this article, we review the dermatoscopic features of nonvenereal dermatosis affecting the genitalia. Although biopsy is required for a definitive diagnosis, dermatoscopy is useful to identify atypical and suspicious pigmentary lesions. For the inflammatory dermatoses and other benign dermatoses, presence of few characteristic findings can aid in the diagnosis.