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Plastic and Reconstructive Surgery - Global Open:
doi: 10.1097/GOX.0000000000000048
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Ultrasound Elastography to Evaluate Keloids

Aya, Rino MD; Yamawaki, Satoko MD; Muneuchi, Gan MD, PhD; Naitoh, Motoko MD, PhD; Suzuki, Shigehiko MD, PhD

Open Access
Japan
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Department of Plastic and Reconstructive Surgery Graduate School of Medicine Kyoto University Kyoto, Japan

Department of Plastic and Reconstructive Surgery Kagawa University Kagawa, Japan

Department of Plastic and Reconstructive Surgery Graduate School of Medicine Kyoto University Kyoto, Japan

Correspondence to Dr. Aya Department of Plastic and Reconstructive Surgery Graduate School of Medicine Kyoto University 54 Shogoin Kawaharacho, Sakyou-Ku Kyoto 606–8507, Japan rinok@kuhp.kyoto-u.ac.jp

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License, where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially.

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Sir:

Ultrasound elastographic methods have provided the means for the objective and noninvasive evaluation of the stiffness of organs, such as the liver, breast, and thyroid. For example, liver ultrasound elastography provides information regarding the stage of fibrosis and can help physicians manage patients.1

We herein report our experience using ultrasound elastography to evaluate keloids. The device used in this study was a HITACHI Hivision Avius ultrasound scanner with real-time strain elastography and the L74M linear (5–13 MHz) probe (Hitachi Medical Corporation, Tokyo, Japan). This device calculates the tissue deformation or strain induced by a stress that is applied with slight free hand compression. The extent of the strain of the tissue is related to its stiffness, that is, the value decreases as the tissue becomes harder. The strain elastography provides a qualitative measurement of stiffness that is expressed as the ratio to a control region, such as the normal dermis.

A 53-year-old man sustained an immature, elevated keloid with pain and itching on his chest (Fig. 1). The strain ratio defined as the normal dermis/keloid value was 21.0 (Fig. 1B). A 31-year-old woman had a mature flattened keloid after intralesional injection of steroids on her left shoulder and the strain ratio (normal dermis/keloid) was 0.76 (Fig. 2). These results suggest that the strain of the immature elevated keloid had a small value, and the strain ratio defined as the value of the normal dermis/keloid was increased compared to that of the mature flattened keloid.

Fig. 1
Fig. 1
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Fig. 2
Fig. 2
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Accurate scar assessment before and after interventional treatments demands a quantitative and noninvasive analysis of the scar properties, but at present, there is no reliable assessment tool for measuring the characteristics of cutaneous scars.2 Although ultrasonography is a technique that can be conveniently used in daily practice and had demonstrated a good basic accuracy and reliability in scar management,2–4 there are no reports that show the stiffness of scars determined using ultrasound elastography.

Although we reported only 2 cases in this study, our data indicate that ultrasound elastography can be used to assess the stiffness of keloids and scars and, consequently, to monitor the effectiveness of conservative treatment of keloids objectively by comparing the stiffness values. This method warrants further development.

Bessonart et al5 examined pathological scars by B-scan ultrasound and demonstrated that the pathologic scars had significantly reduced densitometric values compared with the neighboring healthy skin. In our study, the immature elevated keloid was shown as a hypoechoic area, while the mature flattened keloid had a similar echo signal to normal skin in the B-scan. We can examine B-scans using the same device used for elastography, and a combination of these data may provide useful data for evaluating keloids and scars.

In conclusion, the evaluation of keloids using ultrasound elastography allows for a noninvasive examination to provide objective measurements of the stiffness of the lesions, and it seems to have the potential to be used as a tool to assess skin scars.

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DISCLOSURE

The authors have no financial interest to declare in relation to the content of this article. The Article Processing Charge was paid for by the authors.

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REFERENCES

1. Piscaglia F, Marinelli S, Bota S, et al. The role of ultrasound elastographic techniques in chronic liver disease: current status and future perspectives. Eur J Radiol. July 23, 2013. Epub ahead of print

2. Perry DM, McGrouther DA, Bayat A. Current tools for noninvasive objective assessment of skin scars. Plast Reconstr Surg. 2010;126:912–923

3. Nedelec B, Correa JA, Rachelska G, et al. Quantitative measurement of hypertrophic scar: intrarater reliability, sensitivity, and specificity. J Burn Care Res. 2008;29:489–500

4. Li JQ, Li-Tsang CW, Huang YP, et al. Detection of changes of scar thickness under mechanical loading using ultrasonic measurement. Burns. 2013;39:89–97

5. Bessonart MN, Macedo N, Carmona C. High resolution B-scan ultrasound of hypertrophic scars. Skin Res Technol. 2005;11:185–188

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