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Duplicated Renal Collecting System
Joseph Junewick, MD FACR
over 7 years ago
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Dermoid Cyst

Case Detail

Joseph Junewick, MD FACR
Diagnostic Category: Neoplasia Benign
Created: over 11 years ago
Updated: over 11 years ago
Tags: PEDS
Modality/Study Types: US MR
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7 month old female with non-pulsatile mass in the anterior fontanelle.

Case Images


Dermoid Cyst

Clinical Notes

Pathology – Cystic mass containing grumous gray-white material with pale hair.


US – Mixed echogenic subcutaneous hypovascular mass in the anterior fontanelle external to dural and sinus.

MR – T1 hypointense and T2 hyperintense scalp mass.


Dermoids are benign lesions containing hair, skin appendages, fat, sebaceous glands, and keratin (NOT cholesterol). Dermoids are usually midline or near the midline. Common sites include the superolateral orbit, scalp, brain, nose, neck, mediastinum and ovaries.

Dermoid is the most common scalp mass; differential diagnosis includes cephalohematoma, Langerhans cell histocytosis, angiolymphatic malformation, neurofibroma, chloroma, meningo/encephaloceles.

On MRI dermoids exhibit mixed T1 signal, predominantly high T2 signal and variable enhancement. On sonography dermoids are cystic with variable echogenicity.

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