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Updated: Jul 11, 2026
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Microscopic Cyst Resection for the Treatment of Patients Diagnosed with Epididymal Cyst
Published on: March 31, 2023
Epidermoid cyst of the testis
1Department of Radiology, Chi-Mei Medical Center (Yong Kang Campus), Yong Kang City, Tainan County, Taiwan. makcw33@hotmail.com
Australasian Radiology
|November 2, 2007
Summary
Preoperative diagnosis of epidermoid cysts is possible using ultrasound features like the "onion peel" sign and lack of blood flow. This accurate diagnosis can help avoid unnecessary orchiectomy, favoring testis-sparing surgery.
Area of Science:
- Radiology
- Urology
- Oncology
Background:
- Epidermoid cysts are benign testicular tumors.
- Sonographic appearance can be variable.
- Distinguishing them from other testicular lesions is crucial.
Observation:
- Epidermoid cysts can exhibit an "onion peel" configuration on ultrasound, characterized by concentric rings of alternating echogenicity.
- Color Doppler sonography reveals an absence of vascular flow, consistent with the avascular nature of these cysts.
Findings:
- Combining the "onion peel" sign and absent vascular flow on ultrasound allows for a high degree of diagnostic confidence.
- Absence of elevated biochemical tumor markers further supports the diagnosis of epidermoid cyst.
Implications:
- Preoperative diagnosis of epidermoid cysts is achievable through specific sonographic findings.
- Accurate preoperative diagnosis facilitates testis-sparing surgery, avoiding radical orchiectomy.
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