Cherubism is a rare genetic condition that causes painless, progressive swelling of the jawbones during childhood. The swelling gives the face a round, full-cheeked appearance that reminded early researchers of Renaissance-era cherub paintings, which is how the condition got its name. Fewer than 350 cases have been reported worldwide, and most children with cherubism see their symptoms gradually fade after puberty.
What Happens in the Jaw
In cherubism, normal jawbone is slowly replaced by soft, fibrous tissue packed with specialized cells. This tissue forms growths (called granulomas) that contain fibroblasts and large multinucleated giant cells that resemble the cells responsible for breaking down bone. As these growths expand, they create cyst-like spaces inside the mandible (lower jaw), the maxilla (upper jaw), or both. The majority of cases involve the mandible, though many children develop swelling in both jaws.
The replacement process is painless. The oral mucosa, the soft tissue lining the inside of the mouth, stays intact throughout. There are no associated systemic symptoms like fever or weight loss, which helps distinguish cherubism from infections or cancers that can also cause jaw swelling.
The Genetic Cause
Cherubism follows an autosomal dominant inheritance pattern, meaning a child needs only one copy of the altered gene (from one parent) to develop the condition. The responsible gene is called SH3BP2, which provides instructions for making a signaling protein involved in bone remodeling. Nearly all known disease-causing mutations cluster in a single region of this gene, exon 9, making it a well-defined mutation hotspot. A single letter change in the DNA code is enough to trigger the condition.
Because the inheritance is dominant, an affected parent has a 50% chance of passing the mutation to each child. However, not everyone who carries the mutation develops equally severe symptoms. Some carriers show only mild jaw changes, while others have pronounced facial swelling. Sporadic cases, where neither parent is affected, also occur.
Typical Age of Onset and Progression
Symptoms usually appear between ages two and seven. The jaw swelling increases slowly through childhood, often becoming most noticeable around the time a child’s permanent teeth are coming in. After puberty, the fibrous tissue gradually fills back in with bone and remodels. By age 30, facial abnormalities are typically far less obvious than they were during childhood, and in mild cases they may be nearly undetectable.
This natural regression is one of the defining features of cherubism and a major factor in treatment decisions. The condition essentially has a built-in timeline: it worsens during the growing years and improves on its own as skeletal maturity is reached, with regression extending through the second and third decades of life.
Recognizable Physical Features
The classic appearance includes bilateral (both-sided) fullness of the cheeks and jaw, giving the face a round, symmetrical shape sometimes described as a “moon face.” In more advanced cases, the expanding tissue in the upper jaw pushes upward into the floor of the eye sockets, tilting the eyes slightly upward and exposing a sliver of white below the iris. This characteristic upward gaze is what gives the face its cherub-like quality.
Palpable, painless, movable lymph nodes under the jaw are common and can be one of the earliest signs a parent or doctor notices. These enlarged lymph nodes contribute to the fullness of the lower face.
Dental Problems
The expanding fibrous tissue disrupts tooth development in several ways. Primary (baby) teeth may fall out prematurely. Permanent teeth can be displaced from their normal positions, fail to erupt entirely, or develop in rudimentary forms. Missing teeth and disrupted alignment are common enough that dental abnormalities are often what prompt the first dental X-ray that reveals the condition.
How It Looks on Imaging
On X-rays and CT scans, cherubism produces a distinctive pattern: bilateral, multilocular (multi-chambered) radiolucent lesions that look like dark, cyst-like spaces separated by thin walls of bone. Radiologists sometimes describe this as a “soap bubble” appearance. The bony outer shell of the jaw thins but remains intact, which signals a benign process rather than a destructive or cancerous one.
CT scans in bone-window mode show the expanded jaw with a coarsened internal bone pattern and a ground-glass texture caused by crushed and disorganized internal bone struts. These imaging features, combined with the bilateral and symmetrical nature of the lesions, are highly characteristic and often sufficient for a clinical diagnosis. Genetic testing of the SH3BP2 gene provides definitive confirmation.
How Cherubism Differs From Fibrous Dysplasia
Fibrous dysplasia is the condition most commonly confused with cherubism because both involve normal bone being replaced by fibrous tissue. The key differences are symmetry, genetics, and scope. Cherubism is bilateral and symmetrical, limited to the jaws, and caused by mutations in the SH3BP2 gene. Fibrous dysplasia is caused by a different gene mutation (GNAS1), can affect bones throughout the body, is typically one-sided when it involves the face, and in its polyostotic form can be associated with endocrine abnormalities like early puberty or thyroid problems. Cherubism does not produce systemic manifestations beyond the jaws.
Eye and Vision Complications
When upper jaw lesions grow large enough, they can push upward into the eye socket. This orbital involvement is considered rare and tends to occur later in the disease course, sometimes after the lower jaw lesions have already stabilized. The consequences range from mild (cosmetic proptosis, or bulging of the eye) to more serious: double vision, restricted eye movement, compression of the optic nerve, blockage of the tear drainage duct, and in severe cases, retinal damage. Reported cases of orbital complications have occurred in patients ranging from 7 to 27 years old.
Because orbital involvement can threaten vision, it is one of the main reasons aggressive cases may require intervention rather than watchful waiting.
Treatment Approaches
Because cherubism naturally regresses after puberty, many children are managed with observation alone. The goal is to monitor progression, support dental development, and intervene only when the condition causes functional problems.
Surgery is typically reserved for aggressive cases where the fibrous tissue is obstructing the airway through nasal blockage, interfering with breathing by pushing the tongue backward, preventing permanent teeth from erupting, or encroaching on the eye sockets. Surgical debulking (removing excess tissue) can reduce the bulk of the growths, but recurrence is possible, especially in younger patients whose disease is still in its active phase.
Medical treatments are still being explored. A systematic review of drug therapies found that several classes of medication have been tried in small numbers of patients, including drugs that slow bone breakdown, immune-modulating agents, and a bone-regulating hormone called calcitonin. Among these, denosumab, which blocks the signaling pathway that activates bone-resorbing cells, has shown promise in case reports from Israel and Japan. However, all drug evidence so far comes from individual case reports rather than large trials, so no standard medical protocol exists yet.
For most families, the practical reality is a period of years during which the child’s facial appearance changes noticeably, dental care requires close coordination with specialists, and imaging is done periodically to track whether the lesions are stable, growing, or beginning to regress. The reassurance is that the overwhelming pattern is one of gradual improvement once puberty passes.