Dermoid Dermolipoma and Complex Choristoma


Dermoid tumours are firm or cystic masses, typically occurring at the limbus on the temporal side and are the most frequent epibulbar tumours in children [30]. They are composed of epithelial and/or connective tissue elements that become entrapped within embryonic clefts. On histological examination, the surface epithelium consists of stratified squamous epithelium, frequently containing skin appendages. The stromal component consists of collagen arranged in thick bundles; it contains blood vessels and nerve fibres. If adipose tissue is present, the lesion is called dermolipoma (Figs. 10.1, 10.2). Sometimes cartilage or lacrimal gland tissue is present, these lesions are known as complex choristoma [28, 35].

Dermoids are present at birth and have little or no growth potential. The lesions can occur as isolated ocular lesions or in association with anomalies affecting other organs (Goldenhar's syndrome, mandibulofacial dysostosis and neurocutaneous syndrome) [22, 41, 46, 55, 100, 118].

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