Intradiploic Epidermoid Cyst Presenting as a Cranial Dermal Sinus: A Diagnostic Dilemma
Journal Title: Nepal Journal of Neuroscience - Year 2006, Vol 3, Issue 1
Abstract
Small superficial epidermoid and dermoid inclusion cysts are commonly encountered as “lumps and bumps” in the scalp and at the orbital rim. Their deeper-sited intracranial variants are uncommon however, accounting for less than 1% of all primary intracranial tumours. These related benign lesions, congenital inclusion cysts rather than neoplasms, owe their origin to aberrant ectodermal inclusions occurring during embryonic neurulation. The intradiploic or extradural variety of epidermoid cyst is rarer than the intradural. Intradiploic epidermoids usually present as slow-growing scalp swellings but complications may occur. Intracranial dermoids are rarer entities, distinguished by earlier age of presentation, greater histological complexity and midline situation. A notable feature of these dermoids is the occasional association of a congenital dermal sinus. Here we describe the unusual case of an old lady with an acquired dermal sinus of the parietal bone that presumably resulted from the disruption of an intradiploic epidermoid cyst. The presentation, features and differentials are discussed along with the rationale for diagnosis.
Authors and Affiliations
Sushil Dawka, MS
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