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| Radiologic Findings of Epidermal Cysts in the Trunk |
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| Myung Hyun Kim, M.D. Jae-Joon Chung, M.D.,Kyoung Seuk Park, M.D., Sumi Park, M.D. |
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| Department of Diagnostic Radiology, NHIC Ilsan Hospital |
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| PURPOSE : To evaluate the ultrasonographic (US) or computer tomography (CT) findings of surgically proven epidermal
cysts in the trunk, and to compare the echogenicity of cysts with internal contents.
MATERIALS and METHODS : Forty-five patients were retrospectively evaluated. US and CT findings of epidermal cysts
were assessed in regard to location, size, shape, number, echogenicity, posterior sound enhancement, internal
density, septa, mural nodule and calcification, perilesional infiltration, contrast enhancement, and internal contents.
RESULTS : All 45 patients (M:F=29:16; US in 26, CT in 19) had only one cyst, and they were located in the buttocks
(n=19), back (n=13), inguinal (n=4), posterior neck (n=3), perineum (n=2), abdominal wall (n=2), presternal
(n=1), and axilla (n=1). Of 26 patients who underwent US, there were 8 cases of homogeneously hypoechoic
mass (30.8%), 8 of inhomogeneously hypoechoic mass (30.8%), 7 of homogeneously hypoechoic mass with internal
hypoechoic lines and echogenic spots (26.9%) and 3 of homogeneously hypoechoic mass with internal echogenic
spots (11.5%). Posterior sound enhancement was noted in 21 patients (80.8%). Of 19 patients who underwent
CT, there were 14 cases of simple cyst (73.7%) and 5 of abscess-like lesion (26.3%). Overlying skin
thickening (n=13), contrast enhancement of cystic wall (n=11), perilesional infiltration (n=7), and internal septa
(n=6) were demonstrated. The internal contents of the cysts were keratinous (n=27, 60.0%) or greasy (n=15,
33.3%) material. There was no statistical significance between the echogenicity of the cysts and the internal contents
(p > 0.2).
CONCLUSION : Epidermal cysts showed homogeneous or inhomogeneous hypoechoic mass with posterior sound enhancement
on US. There was no relationship between the echogenicity of the cysts and the internal contents. In
the case of ruptured cyst, an abscess-like lesion with wall enhancement and perilesional infiltration was noted on
CT scan. |
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| Keyword : Soft tissues, US Ultrasound (US) Computed tomography (CT) |
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pdf파일 : 87-92 김명현.pdf 
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> Journal > Journal Search 
Journal of Korean Society of Ultrasound in Medicine 2005 ; 24 (2) : p.87-92
