Subscribe
Share
Share
Embed
The organizing idea is that the history decides the first test, so locate the dysphagia before ordering anything. Food that sticks in the chest seconds after a normal swallow is esophageal dysphagia. Solids first suggest a narrowing, and solids and liquids together suggest a motility disorder. Esophageal dysphagia goes to endoscopy with biopsies from two levels, with alarm features setting the urgency rather than the test. Food impaction is biopsied once cleared, and the history screens for prior surgery, scleroderma, dry mouth, radiation, and amyloid. Trouble at the start of the swallow is oropharyngeal and goes to modified barium swallow, with neuromuscular causes excluded before a Zenker diverticulum is treated by dividing the cricopharyngeus.
Topics covered
Key decisions
This is an AI-generated podcast, and some pronunciations may be imperfect. Thank you for your understanding, and we hope you enjoyed this content.
For the full chapter with MCQs, tables, and primary-guideline references, visit www.boardpearls.com.
Questions or feedback: hello@boardpearls.com.
The most complete gastroenterology board-review podcast on the web, and it is entirely free. This is the GI series from Board Pearls: board review built around clinical reasoning, not recall. Every episode takes one high-yield topic and works it the way you would on rounds: a case to anchor it, the framework that sorts the differential, and the specific decisions the exam rewards. No trivia, no textbook dictation, just the thinking that earns the point.
Over 100 episodes span the full blueprint across nine modules (esophagus, stomach and duodenum, small bowel, colon, pelvic floor, liver, pancreas and biliary, endoscopy, and the cross-cutting topics), grouped by chapter and built from the guidelines and pivotal trials the boards are written from: ACG, AGA, AASLD, and ASGE.
Pair it with the written curriculum, question bank, and AI tutor at boardpearls.com. Questions or feedback: hello@boardpearls.com.
Welcome to Board Pearls. This is episode one of three of the Esophageal Symptoms and Diagnostic Workup chapter, in the Esophageal Disorders module. This episode is dysphagia, trouble swallowing, from the first visit to the first test. A forty-six-year-old man whose food sticks in his chest has eosinophilic esophagitis. His case teaches how the history places dysphagia in the esophagus and separates a narrowing from a muscle problem before any test is ordered, why endoscopy with biopsies comes first, how alarm features change the urgency, and which parts of the history change the workup. A sixty-five-year-old smoker with weight loss shows how alarm features turn the same test into an urgent one. A seventy-six-year-old woman whose trouble starts in her throat has a Zenker diverticulum, and her case teaches how oropharyngeal dysphagia is worked up, why a barium study comes before any endoscope, and how the pouch is treated. A sixty-eight-year-old man who coughs on liquids after a stroke shows the far more common neuromuscular cause.
Here's the first patient. A forty-six-year-old man has had trouble swallowing for two years. Meat and bread stick behind his breastbone a few seconds after he swallows. He stops, drinks water, and waits, and twice he's had to go to the bathroom and bring the food back up. Liquids go down fine. It comes and goes, and it's worse when he eats fast. He hasn't lost weight. He had asthma as a child and has seasonal allergies. He takes no medications and doesn't smoke. His exam is normal.
He has dysphagia, and in every patient with dysphagia the first thing to settle is where it arises, because the two locations lead to different first tests. The history settles it. Oropharyngeal dysphagia is trouble starting the swallow, moving the bolus from the mouth across the upper esophageal sphincter, so those patients cough or choke the moment they swallow, food comes out the nose, they drool, or they aspirate. Esophageal dysphagia is trouble moving the bolus down the tubular esophagus to the stomach once it's on its way, so those patients swallow normally, and a few seconds later the food stops in the chest or the low neck. He swallows without coughing or choking, and the food stops seconds later behind his breastbone. He has esophageal dysphagia.
The history then answers a second question, still before any test: is a narrowing causing it, or a muscle problem? The answer decides which diagnoses are on his list. A mechanical narrowing shrinks the lumen, so it causes trouble with solids first, because a bite of meat needs a wider lumen than a sip of water, and only as the narrowing tightens do softer foods and then liquids start to stick. A motility disorder is a failure of the muscle that pushes the bolus, and when the propagated wave fails, it fails on every swallow, whatever the consistency, solids and liquids together from the start.
Solids first points to a narrowing: a Schatzki ring, an esophageal web, a peptic stricture from reflux, eosinophilic esophagitis, or cancer. Solids and liquids together from the start points to a motility disorder: achalasia, distal esophageal spasm, jackhammer esophagus, or scleroderma esophagus.
He has trouble with solids only, on and off, for two years, the pattern of a narrowing. Within that list, intermittent trouble with solids when he eats fast fits a Schatzki ring, and food impactions in a man with childhood asthma and seasonal allergies fit eosinophilic esophagitis. Before any test, he's down to two leading diagnoses.
Both of them, and every other structural cause, are found the same way, which is why upper endoscopy with biopsies is the first test for nearly all esophageal dysphagia. One procedure covers the whole structural list. It finds rings, webs, strictures, and tumors, it can treat what it finds by dilating a ring or a stricture in the same session, it identifies eosinophilic esophagitis in lining that can look entirely normal, and it rules out cancer.
The biopsies are part of the test, not an option, because eosinophilic esophagitis is a diagnosis made under the microscope, and the esophagus looks normal at endoscopy in up to a third of patients, roughly a tenth to a third across series. So biopsies are taken even when the lining looks completely normal, from two levels, the proximal and the distal esophagus, two to four from each, because the eosinophils can be patchy and one level alone can miss them.
His endoscopy shows an esophagus that looks almost normal, with a few faint linear furrows. The endoscopist takes four biopsies from the distal esophagus and four from the proximal, and they show dense eosinophils at both levels. He has eosinophilic esophagitis, an allergic inflammatory disease of the esophagus, and its diagnostic threshold, at least fifteen eosinophils per high-power field, and its treatment with a high-dose proton pump inhibitor, a swallowed steroid, or an elimination diet follow from here.
Had his biopsies been normal and his symptoms continued, the next test would have been a barium study. A timed barium esophagram can show a subtle ring the scope missed, or the shapes that point to a motility disorder: a bird-beak narrowing at the bottom, tertiary contractions, or a corkscrew esophagus. Those findings lead to high-resolution manometry, the test that defines motility disorders by measuring sphincter relaxation and the strength and timing of the wave. Barium comes in when endoscopy is non-diagnostic or when the story suggests a motility disorder, which is why it isn't his first test.
How fast he's scoped is a separate decision. New dysphagia is itself an alarm symptom, which is why every adult with esophageal dysphagia gets an endoscopy with biopsies, whatever else the patient carries. The features usually memorized as alarm features are age over fifty, unintentional weight loss, iron deficiency anemia, overt or occult gastrointestinal, GI, bleeding, progressive solid-food dysphagia, and persistent vomiting. They don't trigger the endoscopy, because the endoscopy is already happening. They raise the pretest probability of cancer specifically, and that changes how fast the scope is done and what the endoscopist is looking for.
He has none of them, so his endoscopy is routine. The second patient shows the contrast. A sixty-five-year-old man who smokes a pack a day, with three months of steadily worsening dysphagia, first to meat and then to bread and rice, and eighteen pounds of weight loss, gets the same test, an endoscopy with biopsies. His progressive solid-food dysphagia is esophageal cancer until proven otherwise, so he's scoped urgently rather than in six weeks, and if a mass is found, his workup goes straight from biopsy to staging, with computed tomography, positron emission tomography, and endoscopic ultrasound.
The first patient's two episodes of bringing food back up raise the emergency his diagnosis can cause, food impaction. If he arrives in the emergency department with food stuck and can't swallow his own saliva, he needs urgent endoscopy to remove it, because complete obstruction risks aspiration and perforation. Once the bolus is cleared, the esophagus is biopsied in the same session, because eosinophilic esophagitis is the leading cause of food impaction in adults, and a patient whose impaction is cleared without biopsies goes home without his diagnosis.
His history is also checked for things that the standard sequence of endoscopy and then manometry misses unless someone asks. Each one changes the workup, and he has none of them. Prior surgery on the esophagus or stomach, such as a fundoplication or a weight-loss operation, matters most, because it changes the first test: after a fundoplication, the first test is barium, which shows the shape of the wrap, and each operation has its own typical complications.
A connective tissue disease matters because it changes the treatment. A patient with Raynaud phenomenon, tight skin, heartburn, and dysphagia to solids and liquids most likely has scleroderma esophagus, the classic disorder of failed peristalsis with a slack lower sphincter. Fibrosis of the smooth muscle abolishes the peristaltic wave and drops sphincter pressure at the same time, so acid refluxes freely and isn't cleared, causing erosive esophagitis, peptic stricture, and Barrett esophagus. That patient's dysphagia comes from two places, weak transit and the stricture. Treatment is aggressive acid suppression and dilation, not a fundoplication, because a wrap around an esophagus that can't push makes the dysphagia worse.
A dry mouth matters because the esophagus is normal and the problem is upstream. Sjogren syndrome is an autoimmune lymphocytic infiltration of the salivary and tear glands that causes xerostomia, and it removes the lubrication and bolus formation that swallowing depends on. Those patients have trouble starting swallows of dry foods like bread and crackers, better with sips of water and worse at the end of the day. Treatment is salivary stimulation with the muscarinic agonists pilocarpine, five milligrams four times a day, or cevimeline, thirty milligrams three times a day, along with saliva substitutes, humidification of dry rooms, and careful dental care, because a dry mouth decays teeth. Less saliva also means less acid clearance, so Sjogren is a clue to refractory reflux when the two coexist.
Radiation to the chest or neck matters because it causes a stricture long after the treatment. A late radiation stricture appears months to years after radiation, with progressive solid-food dysphagia from fibrosis in the radiation field. It's treated with endoscopic dilation, often repeated, and a complete obstruction may need combined approaches from above and below to reopen it. Swallow therapy during and after radiation lowers the chance of a stricture forming and improves long-term swallowing.
One rarer systemic cause is found on examination rather than in the history. A patient with an enlarged tongue may have amyloid, insoluble fibrils deposited in the esophageal muscle and submucosa, replacing contractile tissue, with a variable manometric pattern. Macroglossia points to light chain, AL, amyloid from a plasma cell disorder, so it calls for serum and urine immunofixation, free light chains, and a skeletal survey or marrow biopsy where appropriate. The other adult form is transthyretin, ATTR, amyloid, either hereditary or wild-type. Treatment targets the amyloid itself, not the esophagus: chemotherapy or autologous stem cell transplant for AL, and tafamidis, patisiran, or inotersen for ATTR.
The third patient's problem is at the very start of the swallow, and her case shows why that changes the first test. A seventy-six-year-old woman has had a year of trouble swallowing, which she feels low in her neck. She hears a gurgling sound when she swallows. Hours after dinner, and sometimes the next morning, food she recognizes from the meal comes back into her mouth, undigested. Her daughter has noticed bad breath. She coughs at night, and two months ago she was treated for pneumonia. After meals she sometimes feels a soft fullness on the left side of her neck. She has no other medical problems and takes no medications.
Her story places the problem at the top of the swallow, oropharyngeal dysphagia, and her particular combination, undigested food returning hours later, bad breath, gurgling, a neck fullness after meals, and aspiration in an older patient, makes a Zenker diverticulum the leading diagnosis. Before that's accepted, the much more common neuromuscular causes are excluded, because they're treated in an entirely different way.
The normal swallow explains her symptoms and that list of causes. The tongue pushes the bolus back, the soft palate seals off the nose, the pharyngeal constrictors squeeze, and the upper esophageal sphincter, the cricopharyngeus, relaxes to let the bolus into the esophagus. When any part of that sequence fails, the complaint matches the part that failed. Coughing or choking as the patient swallows means the bolus is reaching an unprotected airway. Food or liquid coming out of the nose means the palate isn't sealing. Drooling means the mouth isn't holding the bolus. And the trouble is felt in the throat or neck, right as the swallow begins.
Most oropharyngeal dysphagia isn't a structural problem in the throat at all. It's a failure of the nerves or muscles that run that sequence: stroke, Parkinson disease, amyotrophic lateral sclerosis, ALS, myasthenia gravis, and head and neck radiation each disrupt part of it. These are recognized by their systemic findings rather than by the swallow alone, so the examination looks beyond the throat.
The history asks about a stroke, and the exam looks for a facial droop or one-sided weakness, and for the tremor, stiffness, and slow movement of Parkinson disease. Swallowing that worsens as a meal goes on and improves after rest, with drooping eyelids or double vision, is the fatigability of myasthenia gravis, in which antibodies block the postsynaptic acetylcholine receptor at the neuromuscular junction. Wasting and twitching of the tongue, with fasciculations and progressive limb weakness, means ALS, from degeneration of the bulbar motor neurons. Trouble rising from a chair or lifting the arms overhead means an inflammatory myopathy, polymyositis or dermatomyositis, with symmetric weakness of the hips and shoulders, a high creatine kinase, anti-Jo-1 antibodies in some patients, and dysphagia in about half of those with bulbar involvement. Dermatomyositis adds the skin findings: a heliotrope rash on the eyelids, Gottron papules over the knuckles, and the shawl sign across the upper chest and back. And the history asks about radiation to the head and neck.
Each of those findings changes the next step. Myasthenia is confirmed with acetylcholine receptor antibodies, positive in most generalized cases, with muscle-specific kinase, MuSK, antibodies covering some of the seronegative patients. Pyridostigmine, an acetylcholinesterase inhibitor, relieves symptoms by prolonging acetylcholine's action at the synapse, and immunosuppression and thymectomy treat the disease in selected patients. ALS is confirmed by electromyography, which shows the denervation. Dermatomyositis matters beyond the swallow, because it's associated with cancer, most often gastric, lung, ovarian, and breast cancer and lymphoma, so the patient needs age-appropriate cancer screening.
The fourth patient shows what a neuromuscular cause looks like. A sixty-eight-year-old man coughs on thin liquids six weeks after a stroke. He has no regurgitation of old food, no bad breath, and no neck fullness, because his problem is coordination, not a pouch. He gets a modified barium swallow with a speech pathologist, who watches which consistencies he aspirates and which head positions protect his airway, and his treatment is swallow therapy built on those findings, not surgery and not an endoscopy.
Her neurologic exam is normal: no droop, no tremor, no fatigability, no fasciculations, no rash, full strength, and no radiation history. With the neuromuscular causes excluded, her symptoms point to the structural exception, a Zenker diverticulum, which forms at the same junction where the swallow hands off to the esophagus.
A Zenker diverticulum is defined by its anatomy, and its mechanism decides the treatment. It's a pouch of mucosa and submucosa with no muscle layer, a false diverticulum, that bulges backward through a weak spot called Killian triangle, between the oblique fibers of the inferior pharyngeal constrictor above and the transverse fibers of the cricopharyngeus below. It forms because the cricopharyngeus doesn't relax fully during the swallow, a functional outflow obstruction often called cricopharyngeal dysfunction. Every swallow pushes against a partly closed sphincter, and over years that pressure drives the lining out through the weak spot.
That mechanism accounts for each of her symptoms. Food collects in the pouch instead of going down, and because it sits there for hours or days, it comes back undigested and decays, so her breath smells. Air and fluid moving through the pouch gurgle. When she lies down at night, its contents spill into her airway, so she has a chronic cough and gets aspiration pneumonia. Most patients are in their seventies or eighties, and about ninety percent present with dysphagia.
Her diagnosis is confirmed with a barium swallow, before any endoscope. Barium fills the pouch and shows a posterior outpouching at the cervical esophagus. An endoscope passed blindly through the upper sphincter can slip into the pouch instead of the true lumen, and pushing against the thin wall of a pouch with no muscle in it can perforate it.
Barium has a second job in any oropharyngeal dysphagia, in the form of the modified barium swallow, also called a videofluoroscopic swallow study, done with a speech-language pathologist. The pathologist gives liquids and solids of different thickness and tries different head positions while watching each swallow in real time, which shows whether the patient aspirates, on which consistency, and which maneuvers protect the airway. An endoscopy can't answer those questions, because it doesn't show the swallow happening, and that's why endoscopy has no role in the primary evaluation of oropharyngeal dysphagia.
Her barium swallow shows a four-centimeter pouch behind the junction of the throat and esophagus, still holding barium after the rest has cleared, and the speech pathologist sees her aspirate a little of the pouch contents when she lies back.
Her treatment follows from the mechanism. The pouch exists only because the cricopharyngeus doesn't relax, so removing the pouch and leaving the muscle would leave the pressure that made it. Every operation therefore divides the cricopharyngeus, a myotomy, along with treating the diverticulum. It can be done through an open incision in the neck. It can be done transorally, with a stapler placed through the mouth that divides the wall between the pouch and the esophagus in one firing, cutting the cricopharyngeus at the same time and turning the pouch and esophagus into one channel. Or it can be done with a flexible endoscope, Zenker peroral endoscopic myotomy, Z-POEM, in which the cricopharyngeus is divided through a tunnel under the mucosa.
She has a transoral stapled diverticulotomy with myotomy. Her regurgitation stops, her breath improves, and she has no further pneumonia.
The same muscle can fail without making a pouch. A cricopharyngeal bar on barium is a cricopharyngeus that doesn't relax, seen as a shelf pressing into the back of the upper esophagus. It causes the same trouble getting food past the top, without the trapped, undigested food, and it's treated with cricopharyngeal myotomy or, in selected patients, botulinum toxin injected into the cricopharyngeus.
Here are the traps the boards set in these patients.
In esophageal dysphagia, sending the patient for barium or manometry first skips the endoscopy with biopsies that covers the structural list and eosinophilic esophagitis at once. Taking no biopsies because the esophagus looks normal, or biopsying only one level, misses a diagnosis made under the microscope. Clearing a food impaction without taking biopsies sends the patient home undiagnosed. And calling intermittent, solid-only dysphagia a motility disorder misreads the pattern of a narrowing.
In the rest of the history, treating alarm features as the reason to scope misses that they decide how fast the scope is done and what's expected. And offering a fundoplication to a patient with scleroderma wraps an esophagus that can't push.
In oropharyngeal dysphagia, sending throat symptoms to endoscopy first, or passing a scope blindly when the story suggests a Zenker diverticulum, risks perforation and doesn't show the swallow. Forgetting that neurologic and muscular causes are more common than a pouch misses the usual diagnosis. Diagnosing dermatomyositis without screening for cancer misses its associated malignancy. Ordering a standard barium swallow when the question is aspiration skips the modified study with a speech pathologist. And treating a Zenker pouch without dividing the cricopharyngeus leaves the pressure that made it.
So, start to finish.
The history locates the problem: coughing, choking, nasal regurgitation, or drooling at the start of the swallow means oropharyngeal dysphagia, and food stopping seconds later in the chest means esophageal dysphagia. In esophageal dysphagia, solids before liquids means a narrowing, and solids and liquids from the start means a motility disorder.
Esophageal dysphagia goes to endoscopy with biopsies from two levels, even when the lining looks normal, because eosinophilic esophagitis is a diagnosis made on biopsy. Barium and then manometry follow when the scope is non-diagnostic or a motility disorder is suspected. Alarm features raise the probability of cancer and the urgency, not the choice of test. A food impaction is always biopsied once it's cleared, and the history always asks about prior surgery, connective tissue disease, a dry mouth, and radiation.
Oropharyngeal dysphagia goes to a modified barium swallow with a speech pathologist to show aspiration, and the examination looks first for stroke, Parkinson disease, myasthenia, ALS, and myositis. Regurgitation of old undigested food, bad breath, gurgling, and aspiration in an older patient means a Zenker diverticulum. Barium shows it, a blind endoscope can perforate it, and every treatment divides the cricopharyngeus.
Episode two is the other esophageal symptoms: painful swallowing, and the patient whose reflux-like symptoms don't respond to a proton pump inhibitor, PPI.