Usefulness of Comprehensive High - Resolution Ultrasound Imaging in Dermatologic Field: Epidermal Cyst

Kazumi Fujioka*

Received: November 30, 2018;   Published: December 12, 2018

DOI: 10.26717/BJSTR.2018.12.002184

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Abstract

Dermatologic ultrasound (US) has been growing rapidly in line with the development of more potent machines and high-frequency probes. The minimum frequency recommended for performing dermatologic examinations was 15 MHz. Epidermal Cyst is a common slow-growing dermal or subcutaneous epithelial cyst, which contains keratin and is lined by the epidermis. Epidermal cyst is considered as level 1 content of the training program in dermatologic ultrasound by the international working group, called DERMUS (Dermatologic Ultrasound). I review the characteristic findings of epidermal cyst on high-resolution US including gray-scale, color Doppler and Real-Time Tissue Elastography (RTE). Epidermal cyst has been reported as a pseudotestis pattern and nonpseudotestis one on gray scale US. In relation to color Doppler US, unruptured type of epidermal cyst represented no substantial blood flow signals and ruptured type shows pericystic and peripheral vascularity. It is reported that superficial epidermoid tumor shows a softer nature than dose malignant tumor on RTE. It is also reported that RTE is able to detect differences in tissue elasticity between ruptured and unruptured epidermal cysts. The comprehensive procedure using high-resolution ultrasound is useful for the accurate diagnosis of epidermal cyst.

Keywords :Dermatologic Ultrasound; High-Resolution Ultrasonography; Real-Time Tissue Elastography; Color Doppler Ultrasonography; Comprehensive Procedure, Epidermal Cyst

Abbreviations : US: Ultrasound; RTE: Real Time Tissue Elastography; DERMUS: Dermatologic Ultrasound; SE: Strain Elastography