According to the ultrasound report given by your doctor, the enlarged lymph node could be as a result of local lymphadenitis or lymphomas or nasopharyngeal carcinoma.
In your ultrasound report, it has been mentioned that it could be enlarged secondary to the malignancy in the head & neck region. The commonest malignancies to be thought of are either nasopharyngeal carcinoma or Lymphomas. As the blood counts are low, Lymphoma is ruled out. There is no history of fever, pain or tenderness over the swelling, hence lymphadenitis is also ruled out.
To confirm whether it is related to the nasopharyngeal carcinoma, you need to get a nasal endoscopy and a magnetic resonance imaging (MRI) of the brain done. Alternatively, an excision biopsy of the lymph node in the neck can throw some light regarding the histological status of this condition.
Hence, I would suggest you to consult an apt ENT specialist and get a thorough check-up done.
Hope that this information helps and hope that you will get better soon.
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Dr. Naveen Kumar