Epiglottic Cyst: Symptoms, Diagnosis, and Treatment

An epiglottic cyst is a fluid-filled sac that forms on or near the epiglottis, the leaf-shaped flap of cartilage that covers your windpipe when you swallow. Most of these cysts are benign and surprisingly common, turning up in roughly 3 out of every 1,000 people screened in population-level studies. Many people never know they have one because it causes no symptoms at all. When a cyst does grow large enough to cause trouble, it typically produces a sensation of something stuck in the throat, difficulty swallowing, or changes in breathing during sleep, and it almost always responds well to a straightforward surgical procedure.

How Common Are Epiglottic Cysts

Epiglottic cysts are not rare. A large population-based screening study in South Korea found epiglottic cysts to be the fifth most prevalent laryngeal condition, appearing at a rate of about 296 per 100,000 people. That placed them behind laryngitis, vocal nodules, vocal polyps, and Reinke’s edema, but well ahead of conditions most people would consider common throat problems.¹ The true number may be higher, since many small cysts produce no symptoms and are discovered only when a doctor looks down the throat for an unrelated reason.

The condition shows up more often in men than women and can occur at any age.² There are a couple of identifiable risk factors. The same South Korean screening study found a positive association between smoking and the presence of epiglottic cysts. Allergic rhinitis was also linked to a higher likelihood of having one.¹ The connection with smoking fits a broader pattern: chronic irritation of the mucosal lining in the throat may promote the clogging of mucous glands, which is how most of these cysts form in the first place. Allergic rhinitis likely contributes through similar chronic inflammation of the upper airway.

What Symptoms Feel Like

The single most common complaint is globus sensation, that persistent feeling of a lump in the throat even when nothing is there. A literature review covering 32 published case reports of epiglottic cysts in adults found globus sensation in about a third of cases. Difficulty swallowing was the next most frequent symptom, followed by obstructive sleep apnea. Four of the 32 patients in that review had no symptoms whatsoever; their cysts were found incidentally during a procedure or imaging done for something else.³

The symptom picture depends heavily on size and location. A small cyst tucked along the lingual (tongue-facing) surface of the epiglottis may sit quietly for years. A larger one, or one positioned closer to the airway opening, is more likely to interfere with swallowing or breathing. Some patients report a muffled voice, a chronic cough, or a vague throat discomfort that worsens when lying down. In adults, the symptoms tend to creep in gradually as the cyst slowly enlarges, which is why many people live with mild throat irritation for a while before seeking medical attention.

When an Epiglottic Cyst Becomes Dangerous

The vast majority of epiglottic cysts are harmless nuisances. The scenario that warrants genuine concern is airway obstruction. A cyst that grows large enough to hang over the opening of the larynx can partially or fully block airflow, and in rare cases this has been fatal. One forensic report documented a 56-year-old man who died suddenly from asphyxia caused by a large glosso-epiglottic retention cyst combined with swelling of the surrounding tissue.⁴ Cases like this are extreme and uncommon, but they illustrate why large or rapidly growing cysts should not be ignored.

The risk is considerably higher in infants and small children. Their airways are narrow to begin with, so even a modestly sized cyst can produce significant obstruction. Congenital laryngeal cysts sometimes present with stridor, a high-pitched breathing sound that signals partial airway blockage. In pediatric patients, prompt diagnosis and surgical removal are considered essential because the margin between manageable and life-threatening is much thinner.⁵

Another complication worth knowing about is infection. Research on patients hospitalized for acute epiglottitis found that a pre-existing epiglottic cyst was associated with suppurative (pus-forming) infection of the supraglottic area. Infected cysts increased the risk for both airway obstruction and recurrent bouts of acute epiglottitis.⁶ So if you have been diagnosed with an epiglottic cyst and later develop a sudden sore throat with difficulty breathing, fever, or drooling, that combination needs urgent evaluation.

How Doctors Diagnose an Epiglottic Cyst

Many epiglottic cysts are discovered by accident. A gastroenterologist performing a routine upper endoscopy, or an anesthesiologist visualizing the airway before surgery, spots a smooth, round swelling on the epiglottis that the patient never knew was there.⁷ When a patient does come in with symptoms, the standard first step is flexible laryngoscopy. A thin camera is threaded through the nose and into the back of the throat, giving the doctor a direct view of the epiglottis and surrounding structures. The cyst usually appears as a smooth, rounded, translucent or pale swelling.

CT or MRI imaging becomes important for distinguishing an epiglottic cyst from other conditions that can look similar. Acute epiglottitis, for instance, involves swelling of the epiglottis itself rather than a discrete cyst formation, and a CT scan will show diffuse edema. A laryngeal hemangioma, a benign blood vessel tumor, shows specific features on contrast-enhanced CT. Other conditions in the differential include laryngoceles, saccular cysts, and tonsillar cysts.⁸

One reason thorough workup matters is that, on rare occasions, what looks like a benign cyst turns out to be something else. Case reports have documented lesions that initially appeared benign but were later diagnosed as a carcinoid tumor, lymphoma, or spindle cell carcinoma.⁹ These outcomes are uncommon, but they are the reason that tissue removed during surgery is routinely sent for pathological examination.

Is There Any Cancer Risk

For the most common types of epiglottic cyst, the answer is effectively no. Mucous retention cysts, which form when a mucous gland duct gets blocked, carry no malignant potential.⁷ However, there is a less common subtype called an epidermoid cyst. These are lined with skin-like cells rather than mucous membrane, and they carry a small but real risk: roughly 1 in 100 undergo malignant transformation to squamous cell carcinoma or basal cell carcinoma.² This is not a number that should keep anyone up at night, but it is one reason surgeons send excised tissue to a pathologist rather than simply discarding it. If you are told your cyst was a mucous retention type, the malignancy concern is essentially zero.

Treatment Options

Not every epiglottic cyst needs treatment. If it is small, asymptomatic, and discovered incidentally, a watch-and-wait approach with periodic follow-up is reasonable. The cyst has no malignant potential (assuming the common mucous retention type), so removing it purely because it exists is not always necessary. That said, many ear, nose, and throat specialists lean toward removal even for asymptomatic cysts, because a cyst that is small today can grow, and the surgery itself is low-risk.

When treatment is warranted, the standard approach is marsupialization: the surgeon opens the cyst widely so it can drain and its walls collapse, rather than trying to shell out the entire cyst intact. This is typically done through the mouth using a rigid or flexible laryngoscope, which avoids any external incision. Several techniques are used to accomplish this.

Transoral Laser Marsupialization

The most widely reported method uses a CO₂ laser to open and vaporize the cyst wall. In a series of 28 consecutive patients treated this way through the mouth, there was no perioperative bleeding or airway swelling, and none of the patients developed a recurrence over a follow-up period averaging about 16 months.¹⁰ The procedure is done under general anesthesia, and patients generally go home the same day or the next morning. However, the literature review of 32 case reports noted a rupture rate of about 6% with CO₂ laser excision, meaning the cyst burst during surgery, which can complicate the procedure but does not typically cause lasting harm.³

Coblation and Microsurgery

A study comparing three different marsupialization techniques in 90 patients found that all three produced similar cure rates. The differences lay in how the procedure felt for the patient and the surgeon. Marsupialization combined with coblation (a technology that uses radiofrequency energy at lower temperatures than traditional electrocautery) resulted in less bleeding, a shorter procedure, less postoperative pain, and fewer complications compared with standard electric coagulation.¹¹ Adding microsurgery to the coblation technique refined the results further. For patients, the practical takeaway is that the specific tool matters less than the overall approach: marsupialization through the mouth works well regardless of whether the surgeon uses a laser, coblation, or electrocautery.

Office-Based Blue Laser Therapy

A newer option is emerging for patients who either cannot undergo general anesthesia or prefer to avoid it. Office-based blue laser therapy allows the procedure to be performed in the clinic under local anesthesia. A case series reported that all patients tolerated the procedure well, and three out of four achieved complete regression of the cyst and resolution of symptoms.¹² This is still a relatively new approach with limited published data, but it represents a meaningful alternative for older patients, people with significant medical conditions that make anesthesia risky, or anyone who is anxious about a trip to the operating room.

Recurrence After Surgery

Recurrence rates are generally low, but they are not zero. The literature review of 32 case reports found a recurrence rate of about 5.5% for patients treated with a high-frequency electrotome.³ The transoral laser series of 28 patients reported no recurrences at all, though the follow-up period averaged only about 16 months.¹⁰ Follow-up durations in published studies vary widely, from as little as 2 months to nearly 2 years, which makes it hard to pin down a definitive long-term recurrence number. A cyst that seems to have resolved at 6 months could, in theory, refill at 18. The practical advice most specialists give is to schedule at least one or two follow-up laryngoscopy appointments in the year after surgery, and to return if globus sensation or swallowing difficulty returns.

Epiglottic Cysts and Anesthesia

If you know you have an epiglottic cyst and are scheduled for any surgery requiring general anesthesia, this is information your anesthesiologist needs ahead of time. During intubation, the anesthesiologist lifts the epiglottis to slide a breathing tube into the windpipe. A cyst sitting on or near the epiglottis can physically block the tube’s path or, worse, rupture during the attempt, flooding the airway with fluid.

One published case report described a patient whose large epiglottic cyst hung down from the epiglottis by its own weight after the epiglottis was lifted, completely blocking the glottic opening. Standard intubation was impossible. The anesthesia team had to reposition their equipment and thread the breathing tube in from the side of the cyst to reach the airway.¹³ That case ended well, but it underscores the point: a known cyst allows the anesthesia team to plan for a difficult airway, have backup equipment ready, and avoid a dangerous surprise. If you have ever been told about a cyst near your epiglottis, mention it at every pre-surgical consultation, even if the cyst was treated years ago.

Living With a Small, Asymptomatic Cyst

For the subset of people who are told they have a small epiglottic cyst found during an unrelated procedure, the immediate reaction is often worry that is out of proportion to the actual risk. These cysts are benign. The common mucous retention type has no cancer potential.⁷ Many never grow to a size that causes symptoms. The standard recommendation is periodic monitoring, which typically means a follow-up laryngoscopy every 6 to 12 months initially, spacing out to once a year or less if the cyst remains stable.

The signs that should prompt earlier follow-up include new or worsening globus sensation, changes in your voice, snoring or breathing pauses during sleep that were not present before, and difficulty swallowing solid foods. Any of these could suggest the cyst is growing. If you develop sudden difficulty breathing or a high-pitched sound when inhaling, that warrants emergency care rather than a scheduled appointment.

It is also worth knowing that epiglottic cysts can occur in multiples. The same literature review that catalogued symptom patterns included a case in which two cysts were found simultaneously on the same epiglottis, both discovered incidentally.³ The presence of one cyst does not necessarily predict others, but it means your doctor may examine the surrounding area carefully to rule out additional cysts or other lesions during follow-up visits.

1
PubMed. Evaluation of the prevalence of and factors associated with laryngeal diseases among the general population
2
PubMed Central. Epiglottic Epidermoid Cyst: Cadaveric Case Report and Clinical-Surgical Applications
3
PubMed Central. Incidental finding of two epiglottic cysts: Case report and literature review
4
PubMed. Airway obstruction by laryngeal masses in sudden and homicidal deaths
5
PubMed Central. Congenital Laryngeal Cyst as a Rare Cause of Stridor in Infants: Two Case Reports
6
PubMed. The incidence of epiglottic cysts in a cohort of adults with acute epiglottitis
7
PubMed Central. Epiglottic cyst incidentally discovered during screening endoscopy: a case report and review of literature
8
PubMed Central. An Uncommon Epiglottic Cyst Presentation in an Adolescent: A Case Report and Literature Review
9
Online Journal of Otolaryngology and Rhinology. A Case Report of Epiglottic Cyst Mimicking A Laryngocele: A Diagnostic Dilemma
10
PubMed. Transoral laser marsupialization of epiglottic cysts
11
PubMed Central. Clinical effect analysis of microscopic surgery for epiglottis cysts with coblation
12
PubMed. Office-Based Blue Laser Therapy for Epiglottic Cysts: Case Series and Review of the Literature
13
PubMed Central. Difficult endotracheal intubation due to a large epiglottic cyst: A case report