Streaks

From dermoscopedia

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 Editor: Ralph P. Braun

 Author(s): Ralph P. Braun     ·  Oriol Yélamos
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Description In this chapter we describe streakslines radial (always at periphery) streaks Reed nevus melanoma recurrent nevus also calles Pseudopods and radial streamingRadial linear extensions at the lesion edge and their histopathological correlation
Author(s) Ralph P. Braun · Oriol Yélamos
Responsible author Ralph Braun→ send e-mail
Status released
Status update July 27, 2019
Status by Ralph P. Braun


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Streaks schematic 25.jpg
Streakslines radial (always at periphery) streaks Reed nevus melanoma recurrent nevus are lineal pigmented projections at the periphery of a melanocyticThis glossary term has not yet been described. lesion and include radial streaming (lineal streaks) and pseudopods (bulbous projections). Histologically, streaks reveal the radial growth phase of a melanocytic tumor characterized by confluent junctional nests of pigmented melanocytes at the periphery of the lesion (figure) (Massi et al., 2001b). Symmetrical distribution of streaks along the periphery of the entire melanocytic lesion favors the 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 of a spindle cell nevus (Spitz/Reed nevusThis glossary term has not yet been described.), whereas if the distribution is asymmetrical, a superficialThis glossary term has not yet been described. spreadingThis glossary term has not yet been described. melanomaThis glossary term has not yet been described. should be excluded (Braun et al., 2005)
Pseudopod histology.jpg

Needless to say, the statistical probability of this happening is very low unless of course the pathologist uses 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. at the grossing table to orient and oversee the step sectioning process. On occasion, peripheral globulesThis glossary term has not yet been described. and pseudopods can look similar to each other at first glance. However, with peripheral globules one will observe a small clear space separating the globuleThis glossary term has not yet been described. from the main tumor mass. These peripheral globules are presumed to correspond to junctional melanocytic nests at the tips of rete ridgesEpidermal extensions that project into the underlying dermis and they are usually associated with growing/enlarging neviThis glossary term has not yet been described.. In contrast, pseudopods emanate from, and are directly connected to, the main tumor mass through a stalk. Radial streamingRadial linear extensions at the lesion edge appears as radial parallel linear extensions at the periphery of the lesion. On histopathologyThis glossary term has not yet been described., radial streaming also correlates with confluent junctional nests of pigmented melanocytes.

Regular streaks.jpg

Irregular pseudopods .jpg