Oral Board Case: Neck Mass Evaluation

How does this patient's presentation shape your initial differential, and what is the key epidemiologic principle guiding you?

Expected answer

In an adult over 40 with tobacco and alcohol use, a firm, persistent, painless, enlarging neck mass is malignant until proven otherwise. Excluding thyroid masses, roughly 80% of adult neck masses are malignant, most commonly metastatic squamous cell carcinoma to a cervical lymph node from an aerodigestive tract primary. My differential also includes lymphoma, salivary gland tumor, thyroid neoplasm, and less likely a congenital lesion (branchial cleft cyst) or an infectious/inflammatory node.

What specific history and physical exam findings are you seeking?

Expected answer

Red-flag symptoms: rapid growth, dysphagia, odynophagia, otalgia, aural fullness, hearing loss, hemoptysis, epistaxis, paresthesia, hoarseness, dyspnea, weight loss, and night sweats. Full head and neck exam including mobility, tenderness, firmness, fluctuance, erythema, and bruits, plus a complete aerodigestive tract exam — floor of mouth, oral tongue, palate, tonsils, base of tongue, buccal mucosa, nasopharynx, oropharynx, larynx, and nasal cavity, ideally with fiberoptic laryngoscopy — looking for a mucosal primary.

There is no fever, erythema, or fluctuance. Does that change your algorithm?

Expected answer

Yes. Signs of infection (fever, chills, fluctuance, erythema, tenderness, warmth) would prompt a trial of antibiotics with re-evaluation. This patient has none of those, so I move directly to diagnostic imaging rather than empirically treating for infection and delaying a cancer workup.

What imaging do you order and why?

Expected answer

CT with contrast of the neck is the standard first-line modality to characterize the mass, define its relationship to vessels and adjacent structures, and evaluate for nodal disease and a possible primary. MRI is preferred if I suspect perineural or soft-tissue extension. CTA/MRA is used if a vascular lesion is suspected. Ultrasound is the initial modality for pediatric masses and for suspected thyroid lesions, since iodinated CT contrast can delay radioiodine therapy — but for this smoker with a suspicious lateral neck mass, contrast-enhanced CT is appropriate.

How do you obtain tissue, and what pitfall must you avoid?

Expected answer

Fine needle aspiration (FNA) is the preferred first tissue diagnosis — it is low-risk and avoids seeding. Core needle biopsy can be used if FNA is nondiagnostic. Open excisional biopsy of a suspicious lymph node should be avoided as an early step because of the risk of tumor seeding and disruption of tissue planes, which can compromise definitive oncologic surgery and worsen outcomes. Excisional biopsy is reserved for cases where less invasive biopsy fails to yield a diagnosis (e.g., suspected lymphoma requiring architecture).

FNA returns squamous cell carcinoma. What is your next step?

Expected answer

This confirms a neoplastic process. The patient should be referred to a head and neck oncologic surgeon for complete staging. That includes panendoscopy (exam under anesthesia with direct laryngoscopy, bronchoscopy, esophagoscopy) to identify the primary, cross-sectional imaging, and consideration of PET/CT for occult primary and distant disease. Management is then multidisciplinary — surgery, radiation, and/or chemotherapy depending on stage and primary site.

If the workup instead pointed to a congenital or inflammatory lesion, how would management differ?

Expected answer

Inflammatory/infectious lesions are managed conservatively with antibiotics, possibly steroids, and re-evaluation. Congenital lesions (e.g., branchial cleft cyst) are observed with reassessment and elective surgical excision when indicated, and referral to otolaryngology is appropriate. Importantly, a persistent 'branchial cleft cyst' in an older adult can actually be cystic metastatic SCC, so I would not anchor on a benign diagnosis without tissue confirmation.

Why is FNA preferred over excisional biopsy specifically in suspected metastatic SCC of the neck?

Expected answer

Excisional biopsy violates fascial planes, risks tumor spillage and seeding, and has been associated with higher rates of local recurrence and wound complications, potentially converting a curable neck into a more difficult resection. FNA gives a diagnosis with minimal disruption and allows for proper oncologic planning of a neck dissection.