Necrotizing sialometaplasia

• reactive lesion ,chiefly of accessory salivary glands

• begins after trauma as a rapidly growing nodular swelling on the lateral aspect of the hard palate

• usually after dental traeatment

• tissue infarction due to vasoconstriction and ischemia

• initially small painlesss nodule

• eventually enlarges and ulcerates and becomes painfull

• heals in 4-8 weeks

• biopsy is recommended to rule out malignancy

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