Evaluation of Neck Lymphadenopathy in Adults

Initial Risk Stratification

The American Academy of Otolaryngology-Head and Neck Surgery recommends that all adults presenting with neck lymphadenopathy require a systematic risk stratification approach beginning with detailed history and physical examination to identify high-risk features that mandate immediate workup for malignancy 1, 2
Adults with duration of symptoms ≥2 weeks without significant fluctuation or uncertain duration are considered high-risk 3
The absence of infectious etiology is a red flag for malignancy 3
Age >40 years is a risk factor for malignancy 2
Tobacco use, alcohol abuse, or immunocompromised status increases the risk of malignancy 2
HPV-related risk factors, such as increased number of sexual partners or oral sex exposure, increase the risk of oropharyngeal cancer 2
Associated symptoms, including hoarseness, otalgia, hearing loss, dysphagia, odynophagia, weight loss, hemoptysis, nasal congestion, unilateral epistaxis, intraoral swelling/ulceration, or new numbness in the oral cavity, are red flags for malignancy 2, 4

A lymph node size >1.5 cm is considered abnormal and requires further evaluation 1, 2
Firm or hard consistency of the lymph node is a red flag for malignancy 1, 2
Fixation to adjacent tissues (reduced mobility) is a red flag for malignancy 1, 3
Ulceration of overlying skin is a red flag for malignancy 3
Multiple, grouped, or matted lymph nodes are red flags for malignancy 1
A nontender mass is more suspicious than a tender mass 2
Continued increase in size of the lymph node is a red flag for malignancy 1

The American Academy of Otolaryngology-Head and Neck Surgery recommends a targeted physical examination, including visualization of the upper aerodigestive tract mucosa, for high-risk patients 3, 4
Contrast-enhanced CT or MRI of the neck is recommended for high-risk patients 3, 6
Chest CT is recommended to assess for distant metastases in high-risk tumors or second lung primary in heavy smokers 4
FDG-PET/CT is recommended when carcinoma of unknown primary is suspected, lymphoma is suspected, or evaluating neck response after radiotherapy/chemoradiotherapy 4, 6
Ultrasound-guided fine-needle aspiration (FNA) is recommended instead of open biopsy when diagnosis remains uncertain after imaging 3, 6

Complete blood count with differential is recommended to evaluate for hematologic malignancies 6
Serum LDH is recommended to evaluate for lymphoma and provide prognostic information 6
Liver enzymes, serum creatinine, albumin, coagulation parameters, and TSH are recommended to evaluate for underlying conditions 4

p16 immunohistochemistry is recommended on all oropharyngeal squamous cell carcinomas to confirm HPV positivity 4
EBER using ISH is recommended to exclude nasopharyngeal cancer when neoplastic lymph node has unknown primary 4

Cystic neck masses should be evaluated until diagnosis is obtained, and should not be assumed to be benign 3, 5
Up to 80% of cystic neck masses in patients >40 years are malignant 5
Cystic metastases occur in HPV-positive oropharyngeal squamous cell carcinoma, papillary thyroid carcinoma, and lymphoma 4, 5