Pharyngeal & Laryngeal Cancer
- Almost all of these cancers are squamous cell carcinoma (SCC) — they sprout from the wet pink lining of the throat and voice box.
- Two villains drive them: tobacco/alcohol (classic) and HPV (human papillomavirus, the new kid, usually in the tonsils and tongue base). HPV-positive tumors behave better and stage differently.
- Your job on imaging is rarely "is it cancer?" (the scope already saw that) — it's "how far has it spread?": deep into structures, across the midline, into lymph nodes, around nerves.
- The single deal-breaker for the larynx is cartilage invasion — does the tumor stay in the soft tissue, or has it chewed into the thyroid/cricoid cartilage?
- Read it knowing the subsite (nasopharynx, oropharynx, hypopharynx, larynx), because each one has its own staging rules and favorite escape routes.
Think of the throat as a busy hallway where breathing, swallowing, and talking all share the same corridor. The lining of that hallway is delicate wet tissue, and when a cell in that lining decides to go rogue, you get the most common head-and-neck cancer there is: squamous cell carcinoma. The endoscope already told the surgeon what it is. The scanner is there to answer the question the scope can't: how deep, how wide, and how far.
Same cell, four neighborhoods
Squamous cell carcinoma is one cell type, but where it sets up shop changes everything — the symptoms, the staging, even the kind of patient. So we split the corridor into subsites:
| Subsite | Where it lives | The usual story |
|---|---|---|
| Nasopharynx | Behind the nose, up top | Strongly tied to EBV (Epstein-Barr virus); loves to sneak up toward the skull base. |
| Oropharynx | Tonsils, tongue base, soft palate | The HPV-associated darling; often shows up as a neck node before the throat even hurts. |
| Hypopharynx | The funnel below, around the voice box | Frequently sneaky and advanced at diagnosis; bad reputation. |
| Larynx | The voice box itself | Hoarseness brings it in early; staging hinges on cords, cartilage, and spread. |
I find it helps to stop thinking "throat cancer" as one blob and instead ask, which neighborhood? — because that single answer reshapes the whole report.
What you're actually hunting for
On contrast-enhanced CT or MRI, the primary tumor is usually an enhancing soft-tissue mass that thickens and distorts the normally smooth, symmetric lining. MRI is the better detective for soft-tissue extent and for the skull base; CT is fast, great for cortical bone and cartilage, and the everyday workhorse. PET/CT pitches in for nodes, distant spread, and hunting an unknown primary.
The trick is symmetry. The throat is a mirror image of itself, so the tumor is often easiest to spot as the side that doesn't match — a fattened tonsil, an effaced fat plane, a wall that bulges where its twin stays flat.
The larynx and its make-or-break question: cartilage
The larynx deserves its own paragraph because its staging has one famous fork in the road: cartilage invasion. Picture the voice box as a tent held up by stiff cartilage poles (thyroid and cricoid). As long as the tumor stays inside the canvas, it's one thing. The moment it gnaws through a pole, the stage jumps and the surgery changes — sometimes from "save the voice box" to "remove it."
Calling cartilage invasion is genuinely hard, especially on CT, because non-ossified laryngeal cartilage and tumor can look maddeningly alike, and inflammation can mimic invasion. When it's the difference between organ preservation and total laryngectomy, hedge honestly and lean on MRI rather than overcalling it.
There's also the airway itself. These tumors live in the corridor you breathe through, so always glance at how narrow things have gotten — a near-closed airway changes the urgency of the whole case.
Follow the escape routes
Cancer doesn't stay put, and head-and-neck SCC has favorite ways out:
- Lymph nodes. This is the highway. Nodal spread is so central to prognosis that it gets its own framework — read the report against the nodal levels and staging map, and remember HPV-positive disease often presents with cystic-looking nodes that can be mistaken for benign cysts.
- Crossing the midline. A tumor that creeps to the other side of the corridor is a different stage than one that stays home.
- Perineural spread. Some tumors travel along nerves like a subway line, surfacing far from where they started. This is subtle and frequently missed — it has its own page on perineural tumor spread.
HPV-positive oropharyngeal nodes are often cystic or necrotic and can masquerade as a benign branchial cleft cyst in an adult. In a grown-up with a "cyst" near the tonsil region, think tonsil-base primary until proven otherwise — don't let the friendly-looking fluid fool you.
Why HPV changed the conversation
For decades the picture was simple: throat cancer was a smoking-and-drinking disease of older patients. Then HPV-associated oropharyngeal cancer showed up — often in younger, healthier patients — and it behaves so differently (generally better outcomes) that the staging systems were rewritten to score HPV-positive disease on its own scale. Practically, knowing the HPV/p16 status reframes how you read the same scan.
Always note the subsite and, for oropharynx, the HPV status if you have it — those two facts decide which staging ruler the report should be measured against.
Putting it in the report
The endoscope sees the surface; you see the iceberg below it. A useful read answers, in plain terms: which subsite, how deep does it go, does it cross midline, is the larynx's cartilage involved, are the nodes positive and where, and is there any whisper of perineural spread. Nail those and the surgeon and radiation oncologist can actually plan. The full staging scaffolding lives on the head & neck cancer staging page, and the anatomy that makes spread predictable is on neck spaces. After treatment, the rebuilt, scarred neck is a whole separate reading skill — see the post-treatment neck.
If you remember one thing: the scope already knows it's cancer. Your value is the map of where it's going.