Well Circumscribed Cystic Lesions

The most common clinical differential diagnosis of cystic orbital lesions includes dermoid cyst, colobo-matous cyst, teratoma, meningoencephalocele, lymphangioma, acquired inclusion cyst, chronic hematic cyst (cholesterol granuloma), mucocele, subperiosteal hematoma, and parasitic cyst.25 On MRI these lesions appear as well-defined, round to oval lesions with variable signal intensity depending on the composition of their content (Table 10.4).1,2,5,31 Dermoid cyst may have an homogeneous or...