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Congenital Dermoid Cyst over the Anterior Fontanelle:Case report Takahiro ISOZUMI 1 , Atsushi TSUJI 1 , Satoshi NAKASU 1 , Masayuki MATSUDA 1 , Jyoji HANDA 1 1Department of Neurosurgery, Shiga University of Medical Science Keyword: Anterior fontanelle , Dermoid cyst , Congenital inclusion cyst , Bregma , MRI pp.423-427
Published Date 1995/5/10
DOI https://doi.org/10.11477/mf.1436901021
  • Abstract
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We report a case of a 35-month-old Japanese boy harboring a dermoid cyst in the region of the anterior fontanelle, which is rarely reported among Japanese. A small soft subcutaneous mass was noticed in the mid-frontal region at the age of 6 months. On admission, asoft, nontender round mass (2.5cm in diameter) was lo-cated over the anterior fontanelle. Transillumination was negative. Neurological examination yielded normal findings. MRI showed a well-circumscribed mass, which was slightly hypointense on T1W1 and hyperin-tense on T2W1. Midsagittal MRI showed no intracra-nial extension.

At operation, a well-encapsulated mass was found beneath the pericranium, which was easily dissected from the underlying dura mater and removed. The tumor contained caseous material and several hairs. Microscopically, the cyst wall consisted of connective tissues lined by stratified squamous epithelium. Sebaceous glands and hair follicles were found in the subepithelial layer.

It is important to confirm preoperatively whether or not the extracranial mass extends into the intracranial cavity. For this purpose, midsagittal or coronal MRI seems to be most useful.


Copyright © 1995, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院

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