A strange lump that ballooned on a woman’s tongue over the course of six months is something of a medical mystery; it formed due to a rare buildup of goo that sometimes occurs in the mouth, but has no clear cause, her doctors reported.
In a new report of the odd case, published online in July in The American Journal of Dermatopathology, the woman’s doctors said that the lump was caused by oral focal mucinosis, or OFM, a rare connective tissue disorder that normally causes a mass to form on the gums or hard palate. If OFM is rare overall, “OFM of the tongue is even more unusual,” they wrote.
In parts of the mouth affected by the disorder, normal connective tissue breaks down and is replaced by gelatinous, mucus-like goop. That goop is hyaluronic acid, a slippery substance naturally produced by connective tissues that gets overproduced in OFM. The excessive production of hyaluronic acid leads to a buildup that causes a lump to form.
In the newly reported case, a 72-year-old woman in Mexico went to the doctor after such a lump had lingered on the top of her tongue for half a year. She reported that the lump caused her discomfort and pain while speaking and swallowing. The woman’s doctors could easily see the small white lump, which they measured to be about 0.8 by 0.8 inches (2 by 2 millimeters) in size.
Related: Man sprouted thick, green ‘fur’ on his tongue in odd medical case
The typical treatment for OFM involves surgery to remove the lump and then monitoring, to check that it hasn’t come back. That said, recurrence rates are low, the case report notes, and thankfully the condition is benign with no potential to cause cancer. In the woman’s case, her doctors successfully removed the tongue lump under local anesthetic and it didn’t come back after 10 months of monitoring.
So what causes such bubbles of goo to swell in the mouth? Scientists aren’t really sure.
According to the case report, OFM was first described in medical literature in 1974, and since then, about 100 cases have been formally documented. Of these, only seven have been described as affecting the tongue, as opposed to the gums or hard palate.
Some scientists have theorized that the tissue starts pumping out hyaluronic acid in response to some “insult,” like physical trauma. This idea is supported by the fact that the production of mucins — the group of jelly-like, complex carbohydrates that includes hyaluronic acid — can be triggered by inflammatory molecules called cytokines, which get released after tissue injury. In addition, mucins have anti-inflammatory properties, so in theory, they may help tissues repair themselves after injury by tamping down the related inflammation.
Notably, in the woman’s case, she’d reported that there’d been “a previous trauma on the tongue” prior to the troublesome lump’s formation.
However, the idea that OFM may be a result of trauma to the gums, hard palate or tongue is “still controversial,” the case report authors wrote. “Furthermore, despite numerous studies, there has been no significant progress in understanding” how OFM develops, they wrote. Nonetheless, “the suggestive active role of mucin in inflammatory signaling is very intriguing.”
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