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Journal of the American Academy of Dermatology
Volume 68, n° 3
pages e73-e82 (mars 2013)
Doi : 10.1016/j.jaad.2011.08.021
accepted : 24 August 2011
JAAD Online

Skin aging: In vivo microscopic assessment of epidermal and dermal changes by means of confocal microscopy
 

Caterina Longo, MD, PhD a, b, Alice Casari, MD a, Francesca Beretti, PhD c, Anna Maria Cesinaro, MD d, Giovanni Pellacani, MD a, b,
a Dermatology Unit, First Medical Department, Arcispedale Santa Maria Nuova, Reggio Emilia, Italy 
b Department of Dermatology, University of Modena and Reggio Emilia, Modena and Reggio Emilia, Italy 
c Department of Anatomy and Histology, University of Modena and Reggio Emilia, Modena and Reggio Emilia, Italy 
d Department of Pathology, University of Modena and Reggio Emilia, Modena and Reggio Emilia, Italy 

Reprint requests: Giovanni Pellacani, MD, Department of Dermatology, University of Modena and Reggio Emilia, via del Pozzo 71, 41124 Modena, Italy.
Abstract
Background

Skin aging is thought to be a complex biological process that is traditionally classified as intrinsic and extrinsic aging. Several clinical score and instrumental devices have been applied to obtain a precise assessment of skin aging. Among them, confocal microscopy has emerged as a new technique capable of assessing cytoarchitectural changes with a nearly histopathologic resolution.

Objective

We sought to determine the microscopic skin changes occurring on the face in different age groups by means of confocal microscopy.

Methods

The skin of the cheek in 63 volunteers belonging to distinct age groups was analyzed by confocal microscopy. In 4 cases, routine histopathology was performed on site-matched surplus areas from routine excisions for obtaining a better comparison with confocal findings.

Results

Young skin was characterized by regular polygonal keratinocytes and thin reticulated collagen fibers. With aging, more irregularly shaped keratinocytes and areas with unevenly distributed pigmentation and increased compactness of collagen fibers were observed. In the elderly, thinning of the epidermis, marked keratinocyte alterations, and huddles of collagen and curled fibers, corresponding to elastosis, were present. A side-by-side correlation between confocal descriptors and histopathologic aspects has been provided in a few cases.

Limitations

Reticular dermal changes cannot be assessed because of the limited depth laser penetration.

Conclusions

Confocal microscopy was successfully applied to identify in vivo skin changes occurring in aged skin at both the epidermal and dermal levels at histopathologic resolution. This offers the possibility to test cosmetic product efficacy and to identify early signs of sun damage.

The full text of this article is available in PDF format.

Key words : collagen changes, elastosis, in vivo confocal microscopy, SCINEXA score, skin aging

Abbreviations used : KC, RCM



 Funding sources: None.
 Conflicts of interest: None declared.



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