[Re-re-relapse of a MALT lymphoma of the conjunctiva].

Background: The MALT lymphoma (mucosa-associated lymphoid-like tissue lymphomas) is a rare entity and belongs to the low-grade non-Hodgkin (NHL) lymphomas. In 8 % of cases it arises in the conjunctiva. In some cases a MALT lymphoma of the conjunctiva is misdiagnosed as chronic conjunctivitis.

[Congenital mature teratoma of the right orbit].

Background: Teratomas are congenital embryonic tumours composed of a wide diversity of tissues derived from the three germinal layers (ectoderm, mesoderm, endoderm). Located in the orbit they endanger the eye and the bony structures. The main goal of treatment is preservation of the eye.

[Traumatic dislocation of the globe into the maxillary sinus--is a rehabilitation possible?].

Background: The complete traumatic dislocation of the globe into the maxillary sinus after orbital floor fractures is a very rare event. It results from direct transmission of a traumatic force which impinges the orbital frame or may result from an increasing pressure to the orbital contents. Diplopia or evidence of a displaced globe necessitates an exploration and reconstruction of the orbital floor.

Undifferentiated pleomorphic sarcoma of the orbital region.

Undifferentiated pleomorphic sarcoma (formerly known as malignant fibrous histiocytoma) has been established as an entity in the WHO-classification of soft tissue tumors since 2002. Before this the term "malignant fibrous histiocytoma" has been a collective term for soft tissue malignancies that had no distinct components and included most soft tissue sarcomas (40%). With the new classification they account for only about 5%, and tumors arising in the head and neck contribute only about 1-3% of all undifferentiated pleomorphic sarcomas.

Traumatic dislocation of the globe into the maxillary sinus.

The complete traumatic dislocation of the globe into the maxillary sinus is a very rare event. Due to the intense force affecting the orbit, the impact on the globe and its accompanying structures is normally very severe. A case is reported of complete dislocation of the globe into the maxillary sinus with nearly complete recovery of vision and motility.