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Focal, usually mild, spongiosis with overlying scale crust, with a few neutrophils; The crust is often centered on a follicle; The papillary dermis is generally mildly edematous; Dilated blood vessels in the superficial vascular plexus; Mild superficial perivascular infiltrate of lymphocytes, histiocytes and occasional neutrophils.
Histopathological image of dyshidrotic dermatitis, showing focal spongiotic change in the epidermis. Spongiosis is mainly intercellular [1] edema (abnormal accumulation of fluid) in the epidermis, [2] and is characteristic of eczematous dermatitis, manifested clinically by intraepidermal vesicles (fluid-containing spaces), "juicy" papules, and/or lichenification. [3]
By histopathology, superficial dermatitis (in the epidermis, papillary dermis, and superficial vascular plexus) can basically be classified into either of the following groups: [41] Vesiculobullous lesions; Pustular dermatosis; Non vesiculobullous, non-pustular; With epidermal changes; Without epidermal changes.
The dermis contains two vascular networks that run parallel to the skin surface—one superficial and one deep plexus—which are connected by vertical communicating vessels. [8] [11] The function of blood vessels within the dermis is fourfold: to supply nutrition, to regulate temperature, to modulate inflammation, and to participate in wound ...
The dermis contains two vascular networks that run parallel to the skin surface—one superficial and one deep plexus—which are connected by vertical communicating vessels. [ 21 ] [ 25 ] The function of blood vessels within the dermis is fourfold: to supply nutrition, to regulate temperature, to modulate inflammation, and to participate in ...
In vertebrates, a venous plexus is a normal congregation anywhere in the body of multiple veins. [1] A list of venous plexuses: This list is incomplete; ...
Vascular surgery Chronic venous insufficiency ( CVI ) is a medical condition characterized by blood pooling in the veins , leading to increased pressure and strain on the vein walls. [ 1 ] The most common cause of CVI is superficial venous reflux, which often results in the formation of varicose veins , a treatable condition. [ 2 ]
One notable emissary vein, the vein of Vesalius, travels through the sphenoidal emissary foramen inferior to the zygomatic arch, connecting the pterygoid plexus with the cavernous sinus. [3] This is an important route for the spread of infection as cranial nerve VI and the internal carotid pass through the cavernous sinus, with cranial nerves ...