|Description||This chapter describes the criteriameasure of how well one variable or set of variables predicts an outcome of solar lentiginesThis glossary term has not yet been described..|
|Author(s)||Ralph P. Braun · Stephanie Nouveau|
|Responsible author||Ralph Braun → send e-mail|
|Status update||May 28, 2017|
|Status by||Ralph P. Braun|
Solar lentigines, Moth-eaten border, Pigment network, Pseudonetwork, Symmetric brown follicular pigmentation, Homogeneous light brown pigmentation Solar lentigines – cite! Solar lentigines (message) Solar lentigines – participate!
Solar lentiginesThis glossary term has not yet been described. are sharply circumscribed, uniformly pigmented macules that are located predominantly on the sun-exposed areas of the skinThis glossary term has not yet been described., such as the dorsum of the hands, the shoulders, and the scalpThis glossary term has not yet been described.. Lentigines are a result of hyperplasia of keratinocytes and melanocytes, with increased accumulation of melanin in the keratinocytes. They are induced by ultraviolet light exposure.
Unlike freckles, solar lentigines persist indefinitely. Nearly 90% of Caucasians over the ageprocess of becoming older of 60 years have these lesions. Due to the increased prevalence of lentigines in the elderly, these lesions are sometimes referred to as “lentigo senilis”. However, younger individuals who tend to burn after ultraviolet exposure can also develop lentigines after acute or prolonged ultraviolet light exposure. Clinically, solar lentigines may be oval, round, or irregular in shape and can vary from a few millimeters to a few centimeters in diameter. Most lesions have a uniform light brown colorColor (American English) or colour (Commonwealth English) is the characteristic of human visual perception described through color categories, with names such as red, yellow, purple, or blue.; however, there are instances when they vary from dark brown to black. One variant of solar lentigoThis glossary term has not yet been described., “ink-spot” lentigoThis glossary term has not yet been described., has a jet-black color. Actinic purpura or other signs of solar damage can frequently be found in the skin surrounding solar lentigines. Solar lentigines are benignis any condition that is harmless in the long run lesions that can evolve to a pigmented seborrheic keratosisThis glossary term has not yet been described.. Histologically, it is characterized by club-shaped rete ridgesEpidermal extensions that project into the underlying dermis with small nub-like extensions. In addition, there is an increased number of melanocytes and increased pigmentation in the basal keratinocytes. Although most solar lentigines are easily recognized on clinical examinationThis glossary term has not yet been described., some lesions pose diagnostic challenges because their clinical appearance resembles that of melanomaThis glossary term has not yet been described.. DermoscopyThe examination of [skin lesions] with a 'dermatoscope'. This traditionally consists of a magnifier (typically x10), a non-polarised light source, a transparent plate and a liquid medium between the instrument and the skin, and allows inspection of skin lesions unobstructed by skin surface reflections. Modern dermatoscopes dispense with the use of liquid medium and instead use polarised light to cancel out skin surface reflections. can be helpful in correctly differentiating a solar lentigo from melanoma. The key dermoscopic features of solar lentigines are as follows:
Homogenous light brown pigmentationMany lesions have no structuresThis glossary term has not yet been described. or networks, only containing light brown and structureless areas; the term “jelly sign” had been proposed to describe the pigment quality of these lesions. The pigment appears as if jelly had been smeared on the skin surface.
Pigment networkGrid-like pattern consisting of interconnecting pigmented lines surrounding hypopigmented holes.
There may be an area of faint, reticulation. This correlates with the presence of melanocytes and melanin-filled keratinocytes in the rete ridges.
Fingerprint-like areasThey are areas consisting of fi ne parallel running lines of light brown to dark brown colors. They resemble the dermatoglyphics of a human fingerprint.
Lentigines located on the scalp and faceis a central body region of sense and is also very central in the expression of emotion among humans and among numerous other species. share features of pigmented melanocyticThis glossary term has not yet been described. lesions in this special location revealing a pseudonetworkA structureless pigment area interrupted by non-pigmented adnexal openings pattern. This is created when a diffusely pigmented area is interrupted by nonpigmented adnexal openings .circlesThis glossary term has not yet been described.. The pigment is usually light brown in color and similar to the color of the rest of the lesion. While the pigment is usually distributed symmetrically around the follicle, some follicles may appear asymmetrically pigmentedThis glossary term has not yet been described.. These asymmetrically pigmented follicles appear as brown crescent shaped structures. However, these asymmetric follicles will also have a brown color like the rest of the lesion. If the color of the pigment around the follicle, whether symmetric or asymmetric, is of a grayish hue or differs from the rest of the lesion then melanoma needs to enter the differential diagnosisis the identification of the nature and cause of a certain phenomenon. Diagnosis is used in many different disciplines with variations in the use of logic, analytics, and experience to determine "cause and effect". In systems engineering and computer science, it is typically used to determine the causes of symptoms, mitigations, and solutions.
Ink-spot lentigines have their own distinct dermoscopic pattern.These lesions have a very prominent blackpigmented network, which has an almost three-dimensional quality under dermoscopyThe examination of [skin lesions] with a 'dermatoscope'. This traditionally consists of a magnifier (typically x10), a non-polarised light source, a transparent plate and a liquid medium between the instrument and the skin, and allows inspection of skin lesions unobstructed by skin surface reflections. Modern dermatoscopes dispense with the use of liquid medium and instead use polarised light to cancel out skin surface reflections.. The network lines can be either thin or thick in width, and the network ends abruptly at the edge of the lesion