Pigment network

From dermoscopedia

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 Authored by: Ralph P. Braun     ·  Katrin Kerl

 Keywords:   histopathology · pathology · dermatopathology · pigment network
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Description In this cover we describe pigment network and its histologic correlation
Author(s) Ralph P. Braun · Katrin Kerl
Owner Ralph Braun→ send e-mail
Status released
Status update May 24, 2017
Status by Ralph P. Braun
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(=lines reticularpigment network melanocytic lesions dermatofibroma solar lentigo)

Network schematic-42.jpg

The pigment network consists of a grid of intersecting pigmented “linesstreaks” forming a honeycomb pattern. The anatomic basis of the pigment network is melanin in keratinocytes or in melanocytes along the DEJ, representing the way the rete ridgeThis glossary term has not yet been described. pattern of the epidermis appears when viewed in the horizontal plane. The less-pigmented “holes” of the network correspond to tips of the dermal papillae and the overlying suprapapillary plates of the epidermis. A wide diameter of dermal papillae would correspond dermoscopically to wider network “holes,” whereas narrow dermal papillae would result in a denser sieve of the grid. The pigment network in melanocyticThis glossary term has not yet been described. lesions is further characterized as typical or atypical:

Typical networkNetwork with minimal variability in the color thickness and spacing of the lines; symmetrically distributed

Network schematic.jpg
is regularly meshed and composed of lines that are relatively uniform in width and homogenous in 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.; the lines often become gradually thinner and fainter in pigmentation at the lesion’s periphery.
Reguler network.jpg


On histopathologyThis glossary term has not yet been described., the lines of the typical networkNetwork with minimal variability in the color thickness and spacing of the lines; symmetrically distributed correspond to pigment in rete ridges. That are relatively uniform in width and equidistant from each other.
Histology network.jpg

The typical network usually corresponds to the junctional component of a nevusThis glossary term has not yet been described.. However, reticulation can also be seen in darkly pigmented normal skin and heavily pigmented rete ridges as encountered in dermatofibromas.

The atypical networkNetwork with increased variability in the color, thickness, and spacing of the lines of the network; asymmetrically distributed; gray color

is irregularly meshed with lines that vary in width and degree of pigmentation and with “holes” that are heterogeneous in area and shape. An atypical network shows foci with broader and darker pigmented lines; the network often ends abruptly at the lesion’s periphery. An atypical network within a lesion may also appear perturbed and broken up, a finding referred to as “branched streaksBroadened or widened network with broken lines and incomplete connections”.

Atypical network31.jpg

On histolopathology, the irregular lines of an atypical network correspond to variation in the width, length, and spacing of the rete ridges due to variation in the size, spacing, and tendency to confluence of nests of melanocytes. Rete ridges that are elongated and widened by larger junctional nests of melanocytes would appear as darker and wider lines on dermoscopyDermoscopy is a non invasive diagnostic method.. The atypical network is often seen in melanomaThis glossary term has not yet been described. and dysplastic neviThis glossary term has not yet been described..

Atypical network.jpg

PseudonetworkA structureless pigment area interrupted by non-pigmented adnexal openings

The anatomy of the rete ridge pattern of the faceThis glossary term has not yet been described. differs from that of nonglabrous skinThis glossary term has not yet been described.. Accordingly, the pigment network is usually absent in these locations and is replaced by a pseudonetworkA structureless pigment area interrupted by non-pigmented adnexal openings pattern.

Pseudonetwork schematic 23.jpg


Nevus face.jpg



The holes in the reticulation correspond to annexial structures such as sebacous glands, hair follicles or sweat glands.


Histology nevus face.jpg