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Medical Definition of Mucoepidermoid tumour
1. A malignant epithelial tumour of glandular tissue, especially the salivary glands, characterised by acini with mucus-producing cells and by the presence of malignant squamous elements. most mucoepidermoid tumours are low-grade lesions readily cured by adequate excision. They may appear in any age group. They grow slowly. If high-grade, they behave aggressively, widely infiltrating the salivary gland and producing lymph node and distant metastases. (12 Dec 1998)