• Journal of the Korean Society of Radiology
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• v.79 no.6
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• pp.354-358
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• 2018

Epidermal cysts are common benign subcutaneous lesions that occur in or on the skin. It is not very difficult to diagnose subcutaneous epidermal cysts using ultrasound imaging because they exhibit typical sonographic features. However, the differential diagnosis can be confused when epidermal cysts are found in unusual sites. The authors report a case involving a 4-year-old girl who presented with an intramuscular epidermal cyst in the gluteus maximus muscle. Magnetic resonance imaging revealed characteristic internal features of the epidermal cyst, despite being in an uncommon site, and was very useful in the preoperative diagnosis.

• Journal of the Korean Society of Radiology
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• v.84 no.3
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• pp.776-781
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• 2023

Commonly, epidermal inclusion cysts (EICs) are benign cutaneous lesions that are lined with stratified squamous epithelium and may occur in all body parts, including the breasts. EICs in the breast (EICB) are commonly encountered clinically; it may be under-reported because of their mild and nonspecific clinical presentation. Malignant transformation of EICs is extremely rare, occurring 0.011%-0.045%. Presently, we report a rare case of squamous cell carcinoma arising from an EICB of a woman with invasive ductal carcinoma.

• The Journal of the Korean bone and joint tumor society
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• v.20 no.1
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• pp.22-26
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• 2014

An intraosseous epidermal cyst is a rare benign cystic lesion. It is thought to result from congenital factors or trauma and can lead to bone destruction because the cyst develops at the soft tissue around the bone. Radiological findings of intraosseous epidermal cysts are a well-defined radiolucent lesion, with cortical expansion. It is important to differentiate an intraosseous epidermal cyst with other disease developed at distal phalanx because its clinical and radiological findings are similar. We report two rare cases of intraosseous epidermal cysts that developed at the distal phalanx.

• Journal of the Korean Society of Radiology
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• v.82 no.2
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• pp.382-392
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• 2021

Purpose To evaluate the ultrasonographic characteristics of steatocystomas focusing on the features that aid in differentiating them from epidermal inclusion cysts and lipomas. Materials and Methods The ultrasonographic findings of 14 histologically proven steatocystomas in 10 patients were retrospectively reviewed. The following features were assessed: the layer of involvement, shape, margin, echogenicity, posterior acoustic features, and the presence of a visible wall or intralesional striations. The findings were compared with those of subcutaneous lipomas and epidermal inclusion cysts to identify those findings that aid in the differential diagnosis of steatocystomas. Results The majority of steatocystomas appeared as a subcutaneous mass (n = 6, 42.9%) or a mass involving both the dermal and subcutaneous layers (n = 6, 42.9%). Steatocystomas exhibited a well-defined smooth margin (n = 12, 85.7%) and homogeneous echogenicity (n = 9, 64.3%), and showed no specific posterior acoustic features (n = 9, 64.3%). The most important features that differentiated steatocystomas from epidermal inclusion cysts were a homogeneous internal echotexture (p = 0.009) and absent or less prominent posterior acoustic enhancement (p < 0.001). The features that distinguished steatocystomas from lipomas were the margin (p < 0.001), echogenicity (p = 0.034), internal echotexture (p = 0.004), and the absence of intralesional striations (p < 0.001). Conclusion Steatocystomas appeared as well-defined homogeneous masses with mild or absent posterior acoustic enhancement.

• Investigative Magnetic Resonance Imaging
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• v.15 no.2
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• pp.154-159
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• 2011

Testicular epidermoid cyst is a rare benign tumor, accounting for 1-2% of all testicular tumors. It can be cured by organ preserving surgery, so accurate preoperative diagnosis is very important for preventing unneccessary and extensive orchiectomy. We experienced a case of an 18-year-old man who presented with a painless lump in his right testis. The testicular mass showed an onion ring sign on ultrasonography. Computed tomography images showed the mass as a low attenuating lesion with curvilinear calcification. On Magnetic resonance imaging (MRI), the mass appeared as high signal intensity with internal alternating low signal intensity patterns on T2-weighted images. The mass was displayed as having homogeneous high signal intensity on diffusion magnetic resonance imaging and showed lower apparent diffusion coefficient values than normal testis parenchyma, similar to intracranial epidermoid cysts. Testicular MRI with DWI and ADC map can help to more accurately diagnose testicular epidermoid cyst.

• Journal of the Korean Society of Radiology
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• v.83 no.4
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• pp.938-944
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• 2022

Spinal epidermoid cysts are extremely rare benign tumors and can be congenital or acquired. Acquired spinal epidermoid cysts are found in the lumbosacral region. To our knowledge, no case of epidermoid cyst related to spinal cord stimulator insertion has yet been reported. We report the MRI findings of a rare case of thoracic intradural epidermoid cyst acquired after spinal cord stimulator insertion in a 50-year-old female.

• Proceedings of the KSLP Conference
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• 1996.11a
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• pp.81-81
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• 1996

성대낭종은 후두미세수술의 발달로 보다 정확한 진단 및 치료가 가능하므로서 관심도가 증가하고 있다. 성대 낭종은 낭종의 내용물 및 점막상태에 따라 저류성 낭종과 유표피성 낭종으로 분류하고 있는데, 저류성 낭종은 점액 분비선의 폐쇄로 점액이 저류되어 발생하며 유표피 낭종은 선천성으로 상피하층에 파묻힌 상피세포의 잔여물이거나 혹은 파묻힌 상피세포 위에 외상(음성남용)으로 손상된 점막이 재생하는 과정에서 발생한다는 설이 있다. (중략)

• Korean Journal of Head & Neck Oncology
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• v.31 no.2
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• pp.78-81
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• 2015

Sweat gland cancer is very rare with a reported incidence of less than 0.005% of all tumor specimens resected surgically. Diagnosis and management of these cancers are difficult, due to the limited reports in the literature. Here we present a case of an eccrine adenocarcinoma in the retroauricular area and report this case with a review of the literature.

• Korean Journal of Head & Neck Oncology
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• v.30 no.2
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• pp.87-89
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• 2014

Epidermal cysts in mouth floor are rare. There could be confusions in diagnosis due to location and low incidence. For diagnosis, imaging study and cytology are necessary. The treatment of choice is complete excision intraorally or externally and the recurrence is rare. Some authors prefer sclerotherapy, but the follow up is necessary for malignant change. We report two cases of epidermoid cyst in submental area excised externally with literature review.

• Korean journal of dermatology
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• v.56 no.9
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• pp.566-567
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• 2018