Jaw bulge is an abnormal protrusion of the jaw bone. When patients have diseases such as enameloblastoma of the jaw and giant cell tumor of the maxillofacial bone, patients can develop symptoms of jaw bulge. Differential diagnosis: 1. Enamel-forming cell tumor of jaw bone (enamel-forming cell tumor): Clinical manifestations: (1) Jaw bone bulge and facial deformity: the onset of the mandible is more than that of the maxilla, and it is more likely to occur in the molar area and the angle of the jaw, with slow growth and no initial conscious symptoms. (2) The tumor may loosen, resorb and displace the teeth when it affects the alveolar bone. (3) Numbness and discomfort of lower lip: this symptom appears when the tumor compresses the lower alveolar nerve or malignant transformation (incidence is very low). (4) Pathological fracture may occur when there is much bone destruction. (5) Enamel cell tumor of maxillary bone may spread to maxillary sinus, nasal cavity and orbit, and corresponding nasal congestion, supraorbital shift and nasolacrimal duct obstruction may occur. Diagnosis: (1) Painless progressive enlargement of the jaws, which may result in facial deformity, often without specific conscious symptoms. (2) Misalignment of the bite, loosening or loss of teeth, and occasionally pathological fractures. (3) Enlarged jaw bone with nodular and uneven surface, sometimes accompanied by ping-pong ball-like pressure and elasticity. (4) X-rays show enlarged jawbone, irregular multi-room cystic translucent image, the edge of this image is not smooth, there is a semilunar cut, the size of the compartment is different, and if it affects the alveolar bone, there may be obvious “apical infiltration sign” – irregular destruction and resorption of the alveolar process bone at the tip of the root, the root may be jagged or truncated resorption. (5) If there is a rapid growth with painful ulcers and other symptoms, and the x-ray shows the loss of bone interval destruction and a speckled shadow, malignant changes should be suspected. (6) The puncture cyst fluid is often brown, sometimes with cholesterol crystals, but without keratinized epithelium. (7) Pathological histological examination should confirm the diagnosis. (2) Giant cell tumor of maxillofacial bone: Clinical manifestations: (1) Expansion of jaw bone and facial deformity, no conscious symptoms in early stage, slow growth. (2) Loosening of teeth and misalignment of bite when the alveolar bone is affected. (3) X-ray shows soap bubble-like or crest-like cystic shadow with bone expansion. When the patient has enamel cell tumor of the jaws and giant cell tumor of the maxillofacial bone, the patient may have symptoms of jaw expansion. Diagnosis: (1) Jaw expansion and facial deformity with slow growth. (2) Loose teeth and misaligned bite. (3) Radiographs show soap bubble-like or hive-like cystic shadows with bone expansion.