Neck Masses
A board-focused approach to neck masses: triage by age, location, and duration, then apply next-best-step logic — FNA (never excisional biopsy first) for the adult lateral mass, Sistrunk for the midline thyroglossal duct cyst, carotid body tumor you never biopsy, and "metastatic SCC until proven otherwise" in the older smoker.
Approach: age, location, duration
A neck mass is triaged by three questions: age, location, and duration. In children and young adults, most masses are congenital (thyroglossal duct or branchial cleft cysts) or inflammatory (reactive adenopathy after a URI) and are benign. In an adult over 40 — especially a smoker or heavy drinker — a firm lateral neck mass is metastatic squamous cell carcinoma (SCC) until proven otherwise. Midline masses suggest thyroglossal duct cyst, dermoid, or thyroid; lateral masses suggest branchial cleft cyst, nodal metastasis, lymphoma, or carotid body tumor; supraclavicular masses are ominous (chest or abdominal primary). Duration matters: adenopathy under 2 weeks is usually reactive, while a firm node persisting >2–4 weeks, fixed, or >1.5 cm demands workup. The single highest-yield decision on the exam is what to do with a persistent adult neck mass — and the answer is almost never "excisional biopsy first."
- Midline mass that rises with tongue protrusion and swallowing = thyroglossal duct cyst (at/near hyoid); Rx = Sistrunk procedure; confirm a normal orthotopic thyroid first
- Lateral mass along the anterior upper SCM, swells after a URI = branchial cleft cyst (2nd cleft ≈ 90–95%)
- Soft, transilluminating posterior-triangle mass in an infant = cystic hygroma (lymphatic malformation); assoc. Turner syndrome
- Mass at the carotid bifurcation, mobile side-to-side but not vertically, splaying ICA/ECA (lyre sign) = carotid body tumor (paraganglioma) — do NOT biopsy
- Left supraclavicular node (Virchow) → gastric/abdominal or thoracic malignancy
- Rubbery, mobile nodes + B symptoms (fever, night sweats, weight loss) = lymphoma
- Cystic lateral neck mass in an adult >40 may be metastatic HPV+ oropharyngeal SCC mimicking a branchial cleft cyst — never dismiss it as a benign cyst
- Tender node after a cat scratch = Bartonella; posterior cervical nodes + pharyngitis + splenomegaly = EBV mono
Common neck masses at a glance
| Mass | Patient / clue | Buzzword | Best next step / Rx |
|---|---|---|---|
| Thyroglossal duct cyst | Child, midline | Elevates with tongue protrusion | US to confirm thyroid → Sistrunk |
| Branchial cleft cyst | Child/young adult, lateral | Anterior to SCM, swells with URI | Surgical excision |
| Cystic hygroma | Infant, posterior triangle | Soft, transilluminates; Turner | US/MRI; surgery or sclerotherapy |
| Reactive adenitis | Child, post-URI | Tender, mobile, <2 wk | Observe |
| Metastatic SCC | Adult >40, smoker/drinker | Firm/fixed; cystic if HPV+ | FNA → panendoscopy |
| Lymphoma | Any age; B symptoms | Rubbery, mobile | Excisional biopsy |
| Carotid body tumor | Adult; bifurcation | Lyre sign, mobile side-to-side only | CT/MR angiography (no biopsy) |
Vignette: A 58-year-old man with a 40-pack-year smoking history and heavy alcohol use has a firm, 3-cm, nontender mass at the left upper jugular chain for 6 weeks; oral exam looks unremarkable.
Diagnosis: Metastatic squamous cell carcinoma until proven otherwise.
Next best step: fine-needle aspiration (FNA) — not excisional/open biopsy, which seeds tumor, violates tissue planes, and compromises later neck dissection and prognosis. A contrast-enhanced CT (or MRI) of the neck is obtained alongside FNA.
If FNA = SCC → hunt the primary: full head & neck exam plus panendoscopy (laryngoscopy, esophagoscopy, bronchoscopy) with directed biopsies, contrast CT of neck/chest, and HPV/p16 testing (points to a tonsil or base-of-tongue primary). If no primary is seen, obtain PET/CT and proceed to ipsilateral (± bilateral) tonsillectomy with base-of-tongue biopsies. Never resect or irradiate the node before the primary is identified.
Vignette A: A 6-year-old has a painless midline neck mass that rises when she protrudes her tongue and moves with swallowing. → Thyroglossal duct cyst. Get a thyroid ultrasound first to confirm a normal orthotopic gland (the cyst can rarely harbor the only functioning thyroid tissue), then perform the Sistrunk procedure — excise the cyst, the central portion of the hyoid, and the tract to the foramen cecum — which minimizes recurrence.
Vignette B: A 55-year-old has a slowly enlarging mass at the carotid bifurcation that moves side-to-side but not up-and-down and transmits a pulsation; imaging shows splaying of the internal and external carotid arteries (lyre sign). → Carotid body tumor (paraganglioma). Confirm with CT/MR angiography; do not biopsy (highly vascular). Treat with surgical resection ± preoperative embolization.
"Rule of 80s" — a classic (approximate) heuristic for a firm lateral neck mass in an adult (nonthyroid):
- ~80% are neoplastic
- of those, ~80% are malignant
- of the malignant ones, ~80% are metastatic (not a primary tumor)
- of metastases, ~80% arise from a primary above the clavicle (head & neck SCC)
Bottom line: an adult lateral neck mass is cancer until proven otherwise, and the source is usually the aerodigestive tract — so image and scope the head & neck, and start with FNA, not open biopsy.
- Persistent adult neck mass → FNA is the initial diagnostic test (contrast CT/MRI obtained alongside). Open excisional biopsy is reserved for suspected lymphoma (nodal architecture needed) when FNA is nondiagnostic.
- Never open-biopsy a suspected SCC node first — it compromises later neck dissection and prognosis.
- Thyroid nodule: check TSH first and image with ultrasound. Low TSH → radionuclide uptake scan (a "hot"/autonomous nodule is almost always benign, no FNA). Normal/high TSH → FNA guided by size and sonographic risk.
- Supraclavicular node: image chest/abdomen; pursue a GI or lung primary.
- Children: observe reactive nodes; biopsy if >2 cm, hard/fixed, supraclavicular, persisting >4–6 weeks, or with systemic B symptoms.
- Ludwig angina (bilateral submandibular/sublingual swelling, woody floor of mouth, dental source) is an airway emergency — secure the airway first.
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