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Case report: a rare cause of proptosis

Proptosis is the forward protrusion of the eye from its normal position in the orbit. There are many causes, the commonest of both unilateral and bilateral proptosis being thyrotoxicosis. Antral tumours are an uncommon cause of proptosis but one that should be considered in any patient with proptosis. A mucocele is a cystic expansile lesion that is lined with epithelium and filled with mucoid secretions. It results from disrupted or obstructed drainage of the paranasal sinuses. Maxillary sinus mucoceles are infrequent and can result in proptosis, nasal obstruction, facial swelling and involvement of the oral cavity. 
Primary lymphomas of the sinonasal tract are rare, representing approximately 8% of sinonasal malignancies, the maxillary sinus being the commonest site. Malignancy is a diagnosis that must be considered in the aetiology of maxillary mucocele and we believe that this is the first documented case of bilateral maxillary mucocele caused by non-Hodgkin's lymphoma.