Diagnosis and treatment of 64 cases of sublingual gland cysts

The Mystery of the "Swollen Tongue"

Imagine your mouth is a bustling city, and inside it, there are tiny factories called salivary glands. These factories work hard to produce a special lubricant—saliva—to help you swallow and talk smoothly. Usually, this system runs like a well-oiled machine. But sometimes, a pipe in one of these factories, specifically the one under your tongue (the sublingual gland), gets a tiny leak. Instead of flowing where it should, the sticky, egg-white-like fluid escapes and pools up in the soft tissue, creating a squishy, balloon-like lump. In the medical world, this is called a sublingual gland cyst.

Most of the time, these "balloons" stay right under the tongue, where a doctor can easily see and feel them. But occasionally, the leak is so tricky that the fluid squeezes through the muscle floor of the mouth and pops out into the neck, looking like a mysterious swelling down there. This is the "extraoral" or "drooping" type, and it's much harder to figure out. Doctors have been trying to figure out the best way to find these leaks and fix them without causing new problems, like numbness or bleeding. This story is about a team of researchers who looked at a group of patients to see how they handled these tricky cases and what they learned about the best way to pop the balloon for good.

The Story of 64 Patients and the "Leaky Pipe"

A team of doctors at Nantong First People's Hospital decided to play detective. They gathered the files of 64 patients who had come in between January 2022 and December 2025 with these specific "leaky pipe" cysts. They wanted to see who got them, how they were found, and what happened after the surgery.

Out of the 64 patients, there were 42 women and 22 men. The patients ranged in age from a 5-year-old child to an 81-year-old senior, with an average age of about 40. The researchers found that the vast majority—57 out of 64—had the "intraoral" type, meaning the lump was right under the tongue where it could be seen and felt easily. Only 7 patients had the "extraoral" type, where the swelling was hiding in the neck. Interestingly, the lump was slightly more common on the left side of the mouth (35 cases) than the right (29 cases), but the researchers noted that this difference wasn't statistically significant; it was just a random shuffle.

Finding the Leak
For the 57 patients with the lump under the tongue, the diagnosis was straightforward. The doctors just looked and felt, and the diagnosis was clear. However, for the 7 patients with the neck swelling, it was a much bigger puzzle. You can't just look at a neck lump and know it's a saliva leak; it could be many other things. To solve this, the doctors used high-tech tools. They used CT scans for one patient, MRIs for five, and ultrasounds for one. They also used a needle to suck out a tiny bit of the fluid. When they saw that the fluid was thick and looked like raw egg white, they knew for sure it was a sublingual gland cyst. The study suggests that while clinical exams work for the easy cases, the tricky neck cases really need these imaging tools and fluid tests to get the right answer.

The Fix: Cutting the Source
Once the leak was found, the doctors had to decide how to fix it. The main idea was to stop the leak at the source. The "gold standard" treatment they used was to remove the entire sublingual gland, not just the cyst. Think of it like this: if a pipe is leaking, you don't just patch the hole; you replace the whole section of the pipe to make sure it never leaks again.

In 62 of the patients, the surgeons went in through the mouth (the intraoral approach) to remove the gland and the cyst. This took an average of about 52 minutes. For the 7 patients with the neck cysts, 6 of them also had the gland removed through the mouth. One patient, however, had a cyst that was stuck tightly to another gland in the neck (the submandibular gland), so the surgeon had to make an incision in the neck to remove the cyst, the sublingual gland, and the submandibular gland all at once. One other patient got a different, simpler treatment called a "bag-type suture," which is like sewing the cyst into a bag so it drains out, but this was an exception.

The Aftermath
The researchers followed up with these patients for anywhere from 5 months to 4 years. The results were mostly good, but there were a few bumps in the road. Five patients felt numbness in the tip of their tongue after surgery. For three of them, the feeling came back within three months. But for two patients, the numbness lasted for a whole year and hadn't fully gone away yet. One patient had a scary moment where they started bleeding heavily from the mouth three hours after surgery, but a second surgery fixed it, and they recovered normally. No one got an infection, which is great news. However, one patient with the under-the-tongue cyst had the problem come back three months later, and they didn't get treated again.

What the Doctors Learned
The study concludes that while the "under-the-tongue" cysts are easy to spot and fix, the "neck" cysts are a real challenge. The doctors found that removing the whole sublingual gland is the best way to stop the leak, whether the cyst is in the mouth or the neck. Even though this is the preferred method, it's not risk-free; there is still a chance of hurting the nerve that gives the tongue its feeling or causing bleeding. The paper suggests that for the tricky neck cases, you really need a combination of tools—like MRI, ultrasound, and needle tests—to make sure you aren't treating the wrong thing. While the "gold standard" of removing the gland works well, the doctors admit that complications can still happen, and the job isn't always perfectly solved.