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Medicineworld.org: High-frequency ultrasound to diagnose skin cancer

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High-frequency ultrasound to diagnose skin cancer




High-frequency ultrasound with elastography can help differentiate between malignant and non-malignant skin conditions, as per a research studypresented today at the annual meeting of the Radiological Society of North America (RSNA).

"High-frequency ultrasound with elastography has the potential to improve the efficiency of skin cancer diagnosis," said main author Eliot L. Siegel, M.D., vice chairman of the Department of Radiology at the University of Maryland School of Medicine (UMSM) in Baltimore. "It successfully delineated the extent of lesions and was able to provide measurable differentiation among a variety of non-malignant and cancerous lesions".



High-frequency ultrasound to diagnose skin cancer

There are more than one million cases of skin cancer diagnosed in the U.S. every year, as per the American Cancer Society. Melanoma, the most serious type of skin cancer, will account for about 68,720 cases of skin cancer and 11,590 deaths in 2009, despite the fact that with early detection it is highly curable.

Suspicious skin lesions are typically diagnosed by dermatologists and biopsied based on their surface appearance and characteristics. Unfortunately, even to experienced dermatologists, non-malignant and cancerous lesions often appear similar visually and on physical examination, and some cancerous lesions may have a non-malignant appearance, particularly in their early stages. It is not uncommon for patients to have one or more lesions that appear concerning.

"Dermatologists tend to biopsy any lesions that seem visually suspicious for disease,".

said coauthor Bahar Dasgeb, M.D., from the Department of Dermatology at Wayne State University in Detroit and Pinkus Dermatopathology Lab in Monroe, Michigan. "Consequently, a number of non-malignant lesions are needlessly biopsied in order to avoid the risk of missing a potentially deadly melanoma".

Elastography was found to distinguish between non-malignant and cancerous lesions not by their visible appearance but by measuring their elasticity or stiffness. Since malignancies are stiffer than non-malignant growths, elastography, when added to high-frequency ultrasound imaging of the skin, has potential to improve the accuracy of traditional clinical diagnosis of skin cancers and, in some cases, eliminate unnecessary biopsies of non-malignant skin lesions. The procedure is noninvasive, convenient and inexpensive.

For the study, scientists used an ultra high-frequency ultrasound system to image 40 patients with a variety of cancerous and noncancerous, or benign, skin lesions. Cancerous tumors included squamous cell carcinoma, basal cell carcinoma and melanoma. Non-cancerous lesions included dermatofibroma, a nonmalignant growth containing scar tissue, and lipoma, a nonmalignant tumor composed of fatty tissue.

The scientists calculated the ratio of elasticity between normal skin and the adjacent skin lesion, and used laboratory analysis to confirm their diagnoses. Cystic lesions, which are not cancerous, demonstrated high levels of elasticity, while cancerous lesions were significantly less elastic. The elasticity ratio of normal skin to the various skin lesions ranged from 0.04 to 0.3 for cystic skin lesions to above 10.0 for cancerous lesions.

In addition, high-frequency ultrasound with elastography allows for accurate characterization of the extent and depth of the lesion below the surface, which can aid physicians in therapy.

"The visualized portion of a skin lesion can be just the tip of the iceberg, and most dermatologists operate 'blindly' beyond what they can see on the surface," Dr. Siegel said. "High-frequency ultrasound provides almost microscopic resolution and enables us to get size, shape and extent of the lesion previous to biopsy".


Posted by: George    Source




Did you know?
High-frequency ultrasound with elastography can help differentiate between malignant and non-malignant skin conditions, as per a research studypresented today at the annual meeting of the Radiological Society of North America (RSNA). "High-frequency ultrasound with elastography has the potential to improve the efficiency of skin cancer diagnosis," said main author Eliot L. Siegel, M.D., vice chairman of the Department of Radiology at the University of Maryland School of Medicine (UMSM) in Baltimore. "It successfully delineated the extent of lesions and was able to provide measurable differentiation among a variety of non-malignant and cancerous lesions".

Medicineworld.org: High-frequency ultrasound to diagnose skin cancer

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