Diascopy
Diascopy
Diascopy (pronounced: /daɪˈæskəpi/) is a diagnostic test in medicine, typically dermatology, used to determine the nature of a skin lesion by applying pressure with a clear instrument such as a glass slide or petri dish. The term is derived from the Greek words "dia" meaning through, and "skopein" meaning to look or to examine.
Procedure
During a Diascopy, the clinician applies pressure to the skin lesion with a clear instrument. This pressure forces blood out of the superficial blood vessels, allowing the clinician to assess changes in the color of the lesion. The test can help differentiate between vascular and non-vascular lesions, and can also provide information about the depth of pigmentation in the skin.
Types of Diascopy
There are two types of diascopy:
- Negative Diascopy: This is observed in lesions such as Nevus and Melanoma where there is no change in color upon pressure application.
- Positive Diascopy: This is observed in lesions such as Erythema and Telangiectasia where the red color disappears upon pressure application.
Related Terms
- Dermoscopy: A noninvasive, in vivo technique which allows the visualization of skin structures in the epidermis, the dermoepidermal junction, and the papillary dermis, which are not visible to the naked eye.
- Biopsy: A medical test commonly performed by a surgeon, interventional radiologist, or an interventional cardiologist involving extraction of sample cells or tissues for examination to determine the presence or extent of a disease.
- Histopathology: The study of changes in tissues caused by disease.
Etymology
The term "Diascopy" is derived from the Greek words "dia" meaning through, and "skopein" meaning to look or to examine.
External links
- Medical encyclopedia article on Diascopy
- Wikipedia's article - Diascopy
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