MRI findings of an atypical testicular epidermoid cyst: A case report.

Introduction: Typical testicular epidermoid cysts (TECs) manifestate as a target sign or onion skin sign on ultrasonography and magnetic resonance (MR) imaging. Clinicians are increasingly aware of the imaging characteristics of typical TECs, which allow accurate diagnosis and successful treatment while preserving the testicle, but atypical TECs are likely to be misdiagnosed as a malignant intratesticular neoplasm, leading to complete testicular resection.

Patient Concerns: A 26 year-old male patient complained of a painless enlargement of the left testicle that had been present for 1 month.

Imaging in testicular epidermoid cysts.

Objective: To evaluate the utility of findings on ultrasound and magnetic resonance imaging (MRI) for the preoperative diagnosis of testicular epidermoid cysts (TEC).

Methods: The medical records of five patients treated for TEC at our institution between July 2010 and May 2017 were retrospectively reviewed.

Results: Imaging revealed a target or onion skin appearance on ultrasonography and MRI.