spot(redirected from effective focal spot)
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A term of art used in UK histopathology circles, for unknown (“black box”) cases which have such a classic appearance by light microscopy that they can be diagnosed instantly based on pattern recognition.
spotGynecology See Spotting Vox populi A small lesion, usually on the skin. See Age spot, Bald spot, Black spot, Blind spot, Cafe-au-lait spot, Horder spot, Hot spot, Liver spot, Milk spot, Mongolian spot, Oak leaf spot, Powder burn spot, Rose spot, Strawberry spot, White spot.
Bitot spotsSee: Bitot spots
blue spotMongolian spot.
Brushfield spotSee: Brushfield spot
Fordyce spotsSee: Fordyce disease
hypnogenic spotHypnogenic zone.
Koplik spotSee: Koplik spot
Roth spotsSee: Roth spots
ruby spotCherry angioma.
Soemmering spotSee: Soemmering, Samuel T. von
Tardieu spotSee: Tardieu spot
Tay spotSee: cherry-red spot
Trousseau spotsSee: Trousseau, Armand
yellow spotAbbreviation: y.s.
spotA popular term for any small lump or inflamed area on the skin such as a PUSTULE, PAPULE, COMEDONE, CYST, MACULE, SCAB or VESICLE.
baring of the
blind spot A visual field defect in which there is such a marked contraction of the peripheral temporal visual field that it lies on, or nasal to, the blind spot. Although it may occur in open-angle glaucoma, it is not indicative of the disease as it also occurs in other conditions (e.g. miosis). See Bjerrum's scotoma.
Bitot's spot Foamy patch found on the bulbar conjunctiva near the limbus in xerophthalmia and due to vitamin A deficiency. Syn. Bitot's patch.
blind spot Physiological negative scotoma in the visual field corresponding to the head of the optic nerve. It is not seen in binocular vision, as the two blind spots do not correspond in the field. In monocular vision it is usually not noticed. It has the shape of an ellipse with its long axis vertical and measuring approximately 7.5º, whereas its shorter axis along the horizontal measures approximately 5.5º. Its centre is located 15.5º to the temporal side of the centre of the visual field and 1.5º below the horizontal meridian. Syn. blind spot of Mariotte; physiological blind spot; punctum caecum (Fig. S11). See myelinated nerve fibres; retinal image.
blind spot enlargement A visual field defect in which the blind spot appears larger than normal. One of the common causes is papilloedema.
blind spot esotropia; syndrome See Swann's syndrome.
cherry-red spot Bright red appearance of the macular area in an eye with occlusion of the central retinal artery, Tay-Sachs disease or Niemann-Pick disease. In the case of central retinal artery occlusion the surrounding area is white due to ischaemia but the reddish reflex from the intact choroidal vessels beneath the fovea shows at that spot since the retina is thinnest there. There is a very marked, if not complete, loss of vision which appears suddenly. In cases of storage disease (i.e. Niemann-Pick or Tay-Sachs), the area surrounding the fovea is artificially whitened and opaque, offsetting the normal pinkish colour of the fovea (Fig. S12). See Niemann-Pick disease; Sandhoff's disease; Tay-Sachs disease; retinal arterial occlusion.
cotton-wool s'spot See cytoid bodies; exudate.
Elschnig's s'spot Small, yellowish spots found in the fundus in advanced hypertensive retinopathy. They are choroidal infarcts caused by insufficient blood supply.
Fuchs'spot A round or elliptical, pigmented spot, usually located in the macular or paramacular area. It occurs in patients who have pathological myopia. It is due to breaks in Bruch's membrane (called lacquer cracks) and to the development of a choroidal neovascular membrane followed by subretinal haemorrhage which has changed colour and has become pigmented. The patient may notice photopsia when the membrane breaks but eventually it causes a loss of vision with a central scotoma. Syn. Forster-Fuchs spot.
Maxwell's spot Entopic phenomenon in which the subject can observe a dark or greyish spot in the visual field corresponding to this fovea. This is accomplished by viewing a diffusely illuminated field through a purple-blue or dark blue filter. (These are the best colours for this observation.) This phenomenon is used clinically to detect eccentric fixation by placing a fixation point in the diffusely illuminated field. The degree of eccentric fixation can thus be estimated by asking the subject to describe the position of the grey spot with respect to the fixation point. See entoptic image.
Roth's spot A small white spot consisting of coagulated fibrin seen in the middle of a retinal haemorrhage. It is associated with leukaemia, but it can be seen in subacute bacterial endocarditis, diabetic retinopathy, hypertensive retinopathy and vascular conditions with capillary fragility.
Patient discussion about spot
Q. after my husband and i have sex i have spotting and i have really bad cramps what could this be?
Meanwhile you can read more here http://en.wikipedia.org/wiki/Gynecologic_hemorrhage, http://womenshealth.about.com/cs/menstruation/a/bleedaftersex.htm and here http://www.mayoclinic.com/health/bleeding-after-sex/AN01192)
Q. I would like to get more information about Alopesia Areata(hair losing,bald spots all over my head) Well the Alopesia Areata couses the hair falling in big spots all over the head,you start losing your hair in a diferent way than what it ussually is,the doctor told me there is treatment for it but it does not really works,he said that the only thing i can do is just wait between 6 and 18 months, and after all that time my hair should be growing back;but its so traumatic, tha i cant wait that long, i am only 25 years old , i have a life to live ,please help me,i know is not that bad but i cant help it, if anybody knows about some cure ,that really works , please let me know ,thanks.
Q. what is a purple spot on penis