The revealed differences in the structure of horny and cellular layers of epidermis, as well as of papillary and reticular dermis in skin with thin and thick epidermis specify different optical properties of these layers in OCT images.
There is a wide range of equivocal melanocytic lesions that can be clinically and dermoscopically indistinguishable from early melanoma. In the present work, we assessed the possibilities of combined using of multiphoton microscopy (MPM) and optical coherence angiography (OCA) for differential diagnosis of the equivocal melanocytic lesions. Clinical and dermoscopic examinations of 60 melanocytic lesions revealed 10 benign lesions and 32 melanomas, while 18 lesions remained difficult to diagnose. Histopathological analysis of these lesions revealed 4 intradermal, 3 compound and 3 junctional nevi in the “benign” group, 7 superficial spreading, 14 lentigo maligna and 11 nodular melanomas in the “melanoma” group and 2 lentigo simplex, 4 dysplastic nevi, 6 melanomas in situ, 4 invasive lentigo melanomas and 2 invasive superficial spreading melanomas in the “equivocal” group. On the basis of MPM, a multiphoton microscopy score (MPMS) has been developed for quantitative assessment of melanoma features at the cellular level, that showed lower score for benign lesions compare with malignant ones. OCA revealed that the invasive melanoma has a higher vessel density and thicker blood vessels than melanoma in situ and benign lesions. Discriminant functions analysis of MPM and OCA data allowed to differentiate correctly between all equivocal melanocytic lesions. Therefore, we demonstrate, for the first time, that a combined use of MPM and OCA has the potential to improve early diagnosis of melanoma.
The results of analysing the composition of gas and liquid vapor (urine, blood) samples of human organism components by the method of high resolution terahertz spectroscopy are presented. A number of substances that are products of thermal decomposition of blood components have been detected. The proposed approach is promising for creating a method of noninvasive medical diagnostics of pathologies and diseases, including socially significant ones.
The aim of the study was to assess the capabilities of combined application of dual-wavelength fluorescence visualization and contactless skin thermometry during photodynamic therapy monitoring (PDT) of basal cell cancer. Materials and Methods. The study was performed at the University Clinic of Privolzhsky Research Medical University (Nizhny Novgorod). Nine clinically, dermatoscopically, and histologically verified foci of basal cell skin cancer were exposed to PDT sessions (wavelength of 662 nm, light dose density of 150 J/cm 2 ) with systemic application of chlorin-based photosensitizer Fotoditazin. A semiconductor laser system Latus-T (Russia) was employed for irradiation. Dual-wavelength fluorescence visualization and contactless thermometry with an IR pyrometer were used to monitor the PDT sessions. Results. The PDT sessions of nine foci of basal cell cancer were carried out under the control of fluorescence imaging and contactless thermometry. Photosensitizer photobleaching in all foci amounted to 40% signifying a percent of photosensitizer involved in the photodynamic reaction. It has been shown that the combined employment of dual-wavelength fluorescence monitoring and contactless thermometry during the PDT of basal cell skin cancer allows oncologists to control simultaneously the degree of photosensitizer photobleaching and the depth of the photodynamic effect in tissues, the extent of involving the mechanisms associated with hyperthermia as well as the correctness of the procedure conducting. In the course of 9-month dynamic follow-up after the treatment, no clinical and dermatoscopic signs of recurrence were found. Conclusion. A bimodal control of PDT enables the assessment of the correctness and efficacy of the procedure performance. The contactless control of tissue heating allows ensuring the temperature mode for hyperthermia realization, while the fluorescence monitoring makes it possible to evaluate the accumulation of the photosensitizer in the tumor and the depth of the PDT action as well as to predict the procedure efficacy based on the photobleaching data. The complementary use of these techniques allows the adjustment of the mode directly in the course of the PDT procedure. The acquisition of the sufficient statistical data on the combined monitoring will result in the development of a novel PDT protocol.
Objective. To assess the effect of local corticosteroid therapy and Tacrolimus on the morphological and functional skin indices of different phototypes. Materials and methods. The authors conducted a complex assessment of the morphological and functional skin condition of different phototypes among healthy volunteers under the impact of corticosteroids and Tacrolimus. The study involved 20 healthy volunteers (10 people of the 1st and 2nd skin phototypes and 10 people of the 5th and 6th skin phototypes; 14 males and 6 females; mean age: 2з years). The morphological condition of the skin was assessed with the use of optical coherent tomography (Applied Physics Institute, Russian Academy of Sciences, Nizhny Novgorod) while the functional condition was assessed with the use of Multi Skin Test Center MC 750 (Courage+Khazaka Cologne, Germany). Results. The authors revealed that the application of local corticosteroids is accompanied with a reliable reduction in the epidermis thickness developing earlier in the subjects belonging to the 5th and 6th phototypes and, at the same time, increased transepidermal water loss and reduced corneous layer humidity. An increase in the corneous layer thickness accompanied by an increase in the humidity factor was registered in all phototypes in the areas where Tacrolimus was applied. It is possible to select the correct tactics of the anti-inflammatory therapy on the basis of monitoring the morphological and functional skin condition in the process of applying local corticosteroids: to determine the optimum duration of the corticosteroid therapy and switch to calcineurin inhibitors on a timely basis when there is a need to perform an antiinflammatory therapy to achieve the maximum efficacy with the minimum risk of complication development.
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