Lymphomas are relatively rare in the orbit: only about 8-11% of all orbital tumours. The most common histological type is diffuse well-differentiated lymphocytic lymphoma (DWDLL--Rappaport's classification)--70%. Orbital lesions are always curable by radiotherapy, but in some 40% of these patients local recurrence or dissemination occur. The authors present two patients with diffuse well-differentiated lymphocytic lymphoma, and one patient with FCC lymphoma of centrocytic type (Kiel classification) localized in the orbit. Two of them were irradiated after an unsuccessful treatment by chemotherapy. In the third patient local radiotherapy is still in the course.
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