And Tumour Like Conditions

If a mass is found in the superolateral quadrant of the orbit, dermoid cysts and lacrimal gland masses should be considered. Fifty percent of lacrimal gland tumours are pleomorphic adenomas and the other half are malignant [27, 98, 134]. The malignant category includes predominantly adenoid cystic, carcinoma ex pleomorphic adenoma and mucoepidermoid carcinoma. The lacrimal tumours have few distinguishing imaging features, showing mostly a homogeneous character and moderate contrast enhancement. Poorly defined margins with bone destruction suggest a malignancy, but even the malignant lesions can be relatively well defined. The histology of lacrimal gland tumours is similar to that of salivary gland tumours as discussed in Chap. 5. Papil-lomas and squamous cell carcinomas are the benign and malignant tumours most commonly seen in the lacrimal sac. Their microscopic features are similar to those arising from the mucosa of the nose (see Chap. 2) or in the conjunctiva.

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