Diascopy

Diascopy is a diagnostic test in medicine, particularly dermatology, which can be used to determine whether a skin lesion is vascular or nonvascular. It involves the application of pressure to the skin lesion with a glass slide and observing the changes in color.

Procedure

The procedure of diascopy is simple and non-invasive. The clinician applies pressure to the skin lesion with a glass slide. The pressure causes blanching (whitening) of the skin as the blood is pushed out of the capillaries. The clinician then observes the changes in color of the lesion.

Interpretation

The interpretation of the diascopy test depends on the changes in color of the skin lesion. If the lesion turns white or lighter in color, it is likely to be a vascular lesion, such as a hemangioma or telangiectasia. If the lesion does not change color, it is likely to be a nonvascular lesion, such as a melanoma or seborrheic keratosis.

Limitations

While diascopy is a useful diagnostic test, it has its limitations. It is not always accurate, and the results can be influenced by the thickness and pigmentation of the skin. Furthermore, it cannot differentiate between different types of vascular lesions.

See also

• Dermoscopy
• Skin lesion
• Dermatology

References

Diascopy Resources
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