Right-sided neck swelling...

A 15-year-old female has complained of right-sided neck swelling, pain, restricted range of motion, and fever for the last three days. Her physical examination revealed oedema on the floor of the mouth but no signs of dental caries or infection. The salivary gland in the right submandibular area was swollen and painful to the touch. Significant laboratory results included a total white blood cell count of 15,040 per mm3 with a differential count including 72% neutrophils. The C-reactive protein was elevated to 39.9 mg/L, and the erythrocyte sedimentation rate was 24 mm/h. A CT of the head and neck was performed.