What is the appropriate urgent management for a patient treated for infectious mononucleosis two days ago who now has marked tonsillar swelling, a large painful cervical mass, and severe limitation of neck movement?

Urgent Management: Immediate Airway Assessment and ENT Consultation

This patient requires immediate evaluation for potential airway compromise and likely needs urgent ENT consultation, imaging with contrast CT, and consideration of corticosteroids—this is a potential airway emergency complicating infectious mononucleosis.

Immediate Priorities

1. Airway Assessment (Life-Threatening Emergency)

The combination of severe tonsillar swelling, large painful neck mass, and inability to move the neck 2 days after mono diagnosis raises critical red flags:

• Assess for airway obstruction signs: stridor, drooling, inability to swallow secretions, respiratory distress, oxygen desaturation
• Upper airway obstruction is a rare but potentially fatal complication of IM requiring immediate intervention 1
• If any signs of airway compromise exist, this patient needs:
  • Immediate ENT consultation
  • Preparation for possible intubation or surgical airway
  • ICU-level monitoring 1, 2

2. Determine the Nature of the Neck Mass

Critical distinction: Is this reactive lymphadenopathy from mono versus a suppurative complication?

Signs suggesting bacterial superinfection/abscess (peritonsillar or deep neck):

• Severe, rapidly progressive pain limiting neck movement
• Unilateral tonsillar swelling with uvular deviation
• Trismus
• "Hot potato" voice
• Fever, systemic toxicity
• Fluctuance on examination

Key point: While reactive cervical lymphadenopathy commonly occurs with IM 3, the severity described here (patient can barely move neck, "large" mass) suggests either:

1. Severe reactive adenopathy with impending airway obstruction
2. Bacterial superinfection (peritonsillar abscess, deep neck abscess, or rarely necrotizing fasciitis 4)

Diagnostic Workup

Imaging is Mandatory

Order contrast-enhanced CT of the neck immediately 3:

• This is a strong recommendation for neck masses at increased risk 3
• Will differentiate reactive adenopathy from abscess/phlegmon
• Assesses airway patency and degree of compromise
• Evaluates for deep neck space involvement or mediastinal extension 4

Laboratory Assessment

• Complete blood count (expect lymphocytosis with atypical lymphocytes in IM)
• CRP/ESR (markedly elevated suggests bacterial superinfection 5)
• Blood cultures if febrile/toxic appearing

Treatment Algorithm

If Imaging Shows Abscess Formation:

• Surgical drainage is required 6, 5
• Broad-spectrum IV antibiotics covering oral flora (clindamycin or ampicillin-sulbactam)
• Avoid amoxicillin/ampicillin alone due to high risk of morbilliform rash in IM patients
• Consider admission for IV antibiotics and monitoring 6

If Severe Reactive Adenopathy Without Abscess:

Systemic corticosteroids are indicated for severe IM with airway compromise 1, 2, 7:

• Dexamethasone 10mg IV or prednisone 40-60mg PO
• Evidence supports corticosteroid use specifically for upper airway obstruction in IM 1, 2
• Monitor closely for response over 24-48 hours
• If no improvement or worsening despite steroids, consider acute tonsillectomy 2, 7

Antibiotic Considerations

Do NOT routinely prescribe antibiotics for IM unless clear signs of bacterial infection 3:

• The guideline strongly recommends against routine antibiotics for neck masses without infectious signs 3
• However, if there are local signs of bacterial infection (warmth, erythema, fluctuance, severe unilateral progression), a single course of broad-spectrum antibiotics is reasonable 3
• Critical caveat: 23.4% of severe IM patients develop peritonsillar abscess 6, so maintain high suspicion

Disposition

Admit for observation if:

• Any concern for airway compromise
• Severe pain limiting oral intake
• Need for IV medications
• Uncertain diagnosis requiring serial examinations

ENT consultation is warranted for:

• Suspected abscess requiring drainage
• Airway compromise not responding to medical management
• Consideration of acute tonsillectomy if severe UAO persists despite corticosteroids 7

Critical Pitfalls to Avoid

1. Underestimating airway risk: Upper airway obstruction in IM can progress rapidly and be life-threatening 1, 2
2. Missing bacterial superinfection: The pain severity and neck immobility suggest more than simple reactive adenopathy—imaging is essential
3. Delaying imaging: Don't wait to "see how they do"—get the CT now 3
4. Prescribing amoxicillin: If antibiotics are needed, avoid amoxicillin/ampicillin due to rash risk in IM
5. Assuming it's "just mono": Rare but serious complications include necrotizing fasciitis 4, which requires emergency surgical debridement

Bottom line: This patient needs immediate airway assessment, urgent contrast CT neck, and likely hospital admission with ENT involvement given the severity of presentation just 2 days after initial diagnosis.