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A 14-year-old boy presented with a 6-year history of intermittent right submandibular swelling. It arose with no specific trigger but was associated with pain on swallowing. It usually lasted several hours before spontaneously subsiding. There was no pyrexia, sore throat, tuberculosis contact or foreign travel.
On examination the lump measured 3×3 cm, was non-tender, firm, mobile, non-fluctuant, with normal …