What are the typical clinical presentations of lymphoma in a one‑year‑old child?

Lymphoma Presentation in a 1-Year-Old Child

Lymphoma in a 1-year-old is exceedingly rare and presents most commonly with rapidly progressive systemic symptoms, extranodal involvement (especially abdominal masses), and potential oncologic emergencies requiring immediate recognition.

Key Clinical Presentations

Constitutional and Systemic Symptoms

The most common presentations in very young children with lymphoma include 1:

• Fever, chills, and night sweats (B symptoms)
• Irritability (particularly important in infants who cannot verbalize symptoms)
• Fatigue and decreased activity
• Unexplained weight loss or failure to thrive
• Bone pain

Site-Specific Manifestations

Abdominal Disease (most common extranodal site in pediatric lymphoma) 1:

• Abdominal pain and distension
• Palpable abdominal mass
• Poor appetite/early satiety
• Constipation
• Nausea and vomiting
• Can present as acute bowel obstruction 2, 3

Intrathoracic Involvement 1:

• Coughing, dyspnea, wheezing, or stridor
• Chest pain
• Reduced endurance
• Superior vena cava syndrome (oncologic emergency)
• Respiratory compromise (oncologic emergency)

Head and Neck Disease 1:

• Painless lymphadenopathy (regional or diffuse)
• Swelling in neck, jaw, gingival area, or maxilla
• Difficulty swallowing or choking
• Vision changes

CNS Involvement 1:

• Bladder or bowel dysfunction
• Lower extremity weakness
• Headaches
• Cranial nerve palsies

Critical Pitfalls and Oncologic Emergencies

Recognize these life-threatening presentations immediately 1:

• Tumor lysis syndrome (from rapid tumor growth)
• Superior vena cava syndrome
• Respiratory compromise from mediastinal mass
• Spinal cord compression

Special Considerations for Infants

Extremely Rare Age Group

Lymphoma in children under 3 years is exceedingly rare 4. The youngest reported case of classical Hodgkin lymphoma was 8 months old 4, and a 1-year-old with DiGeorge syndrome developed EBV-related Hodgkin lymphoma 5.

Immunodeficiency Association

In infants presenting with lymphoma, strongly consider underlying immunodeficiency 5, 4:

• DiGeorge syndrome (22q11.2 deletion)
• HIV/AIDS
• Other primary immunodeficiencies
• History of recurrent severe infections
• T-cell defects
• EBV infection with progressively increasing viral loads

Atypical Presentations in Infants

Unlike older children, infants may present with 5, 4:

• Absence of typical lymphadenopathy (as seen in the 8-month-old case)
• Developmental delays or failure to achieve neurologic milestones
• Recurrent infections as the primary complaint
• Rapidly progressive pulmonary disease (initially appearing as interstitial-alveolar inflammation, then progressing to multiple lung nodules)
• Vertebral collapse with spinal cord compression
• Hepatosplenomegaly

Diagnostic Approach

Immediate Workup Required 1

When lymphoma is suspected in a 1-year-old:

1. History and physical examination focusing on:

   • Duration and progression of symptoms
   • Immunodeficiency history or recurrent infections
   • Family history of malignancy or genetic syndromes
   • Cardiac malformations (DiGeorge association)

2. Laboratory evaluation:

   • Complete blood count
   • Comprehensive metabolic panel (assess for tumor lysis)
   • LDH and uric acid
   • Immune evaluation (T-cell subsets, immunoglobulins)
   • EBV DNA copy number
   • HIV testing if indicated

3. Tissue diagnosis (essential):

   • Excisional or incisional biopsy of most accessible site
   • Fresh tissue in saline for viability
   • Morphology and immunohistochemistry
   • Flow cytometry (minimum requirement)
   • Cytogenetics (MYC rearrangement for Burkitt)

4. Staging workup:

   • Bilateral bone marrow aspirate and biopsy
   • Lumbar puncture (CNS evaluation)
   • FDG-PET/CT or PET/MRI if available
   • Do not delay treatment to obtain PET scan

5. Genetic testing:

   • Whole-exome sequencing if immunodeficiency suspected
   • Screen for chromosome 22q11.2 deletion (DiGeorge)

Lymphoma Subtypes in Very Young Children

Non-Hodgkin lymphoma (NHL) is more common than Hodgkin lymphoma in young children 1:

• Burkitt lymphoma (most common pediatric NHL)
• Diffuse large B-cell lymphoma
• Both are highly aggressive but curable 1

Hodgkin lymphoma is extremely rare under age 3 6, 4, but when it occurs:

• Often associated with immunodeficiency
• Frequently EBV-related
• May present without typical lymphadenopathy

Management Principles

Treatment must occur at centers with pediatric oncology expertise 1. The complexity of managing lymphoma in infants, combined with potential underlying immunodeficiency and rapid disease progression, requires immediate multidisciplinary coordination including pediatric oncology, immunology, and surgical subspecialties.

Baseline cardiac evaluation (echocardiogram) is essential before initiating anthracycline-based chemotherapy 1.