Overview of epidermoid cyst

Area of Science:

• Dermatology
• Radiology
• Medical Imaging

Background:

• Epidermoid cysts are common, slow-growing, painless subcutaneous masses.
• They are characterized by a central punctum, representing the pilosebaceous follicle's orifice.
• These cysts can lead to cosmetic and functional impairments if not treated.

Purpose of the Study:

• To describe the characteristic imaging findings of epidermoid cysts on ultrasound and MRI.
• To highlight the utility of these imaging modalities in differentiating epidermoid cysts from neoplastic lesions.

Main Methods:

• Review of ultrasound features including shape, margins, vascularity, acoustic enhancement, and shadowing.
• Analysis of MRI signal intensities on T1-weighted and T2-weighted sequences.
• Evaluation of diffusion-weighted imaging (DWI) characteristics.

Main Results:

• Ultrasound reveals well-circumscribed, avascular, round to oval masses with dorsal acoustic amplification and lateral shadowing.
• MRI demonstrates slightly hypointense T1 signal and intermediate to high T2 signal.
• Restricted diffusion on DWI is a typical finding for epidermoid cysts.

Conclusions:

• Ultrasound and MRI provide distinct imaging signatures for epidermoid cysts.
• Characteristic imaging findings aid in differentiating epidermoid cysts from potentially malignant neoplasms.
• Early diagnosis through imaging facilitates appropriate management and prevents complications.