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Tumours such as fibrosarcoma, malignant haemangiopericytoma, liposarcoma, chondrosarcoma, ameloblastic carcinoma, lymphoma and plasmacytoma are extremely rare, and diagnosis is always based on histopathology. Soft tissue sarcomas are managed by surgery with or without radiotherapy, while lymphoreticular malignancies are managed by chemotherapy with or without radiotherapy.

Figures 1: Non-Hodgkin lymphoma of the oral cavity. Note the fleshy growth involving the right upper gingiva extending from the canine to the third molar.
Figure 2: Lymphoblastic lymphoma in a 12–year-old boy. Note the fleshy growth involving the left side of the posterior aspect of the tongue.
Figures 3: Note the diffuse swelling on the left side of the cheek with extension to the infratemporal fossa (arrows). Biopsy from the lesion showed a high-grade sarcoma.
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