What do you mean by focus?

In the same tissue (organ), the lesion is confined to a small area, and the structure and function of the surrounding adjacent tissues are normal and unaffected, which is called focal.

For example, in renal pathology, a focal disease is defined as a focal lesion in which glomerular involvement is less than 50% under the light microscope. & gt This is 50% diffusion.

Focal attacks are usually preceded by aura, such as local tingling, tingling or spasm, and unconscious disorder. Exercise or muscle clonus often occurs. More limited to one side of the cerebral hemisphere, it is a gradual movement of deviance.

It lasts for half a minute to a few minutes, and then it stops. There is temporary limb paralysis. It may also spread to the whole brain, causing generalized convulsions, just like grand mal's, loss of consciousness and generalized convulsions, which are called generalized transmission after local seizures.

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Focal glomerulonephritis, also known as focal glomerulonephritis, FSGS. This name may sound obscure to patients, but it is actually a rare glomerular disease, which can lead to nephrotic syndrome in China.

Focal scleroderma, also known as scleroderma, is a local swelling of the skin, which gradually hardens and shrinks. There are good hairs on the scalp, forehead, waist, abdomen and limbs. Skin lesions began to appear reddish in different sizes, accompanied by one or more mild edema spots.

After hardening, it gradually appears pale yellow or yellowish white. The surface is smooth and shiny like wax, the center is slightly concave, the hair of the affected area falls off, the sweat decreases, and the surrounding capillaries dilate, showing purple or dark color. Advanced skin atrophy, hypopigmentation. Skin lesions are different in shape. According to different shapes, it can be divided into four types: spotted hair, banded hair and spotted hair, of which spotted hair is the most common.

References:

Baidu encyclopedia-focal inflammatory reaction

Baidu encyclopedia-focal epilepsy