A 2 year old girl is brought into the Emergency Department by her parents. She has recently had some coryzal symptoms. Today when the child was picked up from kindergarten, the parents noticed a lump on the left side of the neck. It had not been there the morning before. The child is febrile at 38.3, but otherwise has a normal examination. She looks well, is happy and playful.
She has a unilateral cervical node swelling of about 15mm diameter. Nil else.
If the lump is only in the cervical region and of recent onset, it is most probably going to be VIRAL. Think of URTI, or Infectious mononucleosis. It can also be bacterial (especially if the node is >15mm) and can be related to dental infection and tonsillitis. Be sure to exclude https://www.resus.com.au/neck-lump/. If persistent, think of TB.
If not localised to the cervical region, some of the same causes as above apply i.e. infectious mononucleosis, CMV, Toxo. But now we need to also start thinking of the leukaemia and lymphoma as well.
If the node is large and fluctuant , consider incision, but beware that this is not TB.
Most bacterial causes are from Staph aureus or Group A Strep (pyogenes).
If the child is well, antibiotics (flucloxacillin/Cephalexin).
If the child is unwell, or has failed antibiotics or is <1 month old, admit for IV antibiotics.