Mucinous cystadenoma (MCA) usually occurs in the appendix, ovary, kidney, and pancreas. MCA is sometimes considered a borderline tumor. In the oral and maxillofacial region, MCA most commonly occurs in the parotid glands and the minor salivary glands; however, the frequency is low. We describe a 65-year-old woman who had a slowly enlarging tumor, 10mm in diameter, in the hard palate. Magnetic resonance images of the lesion revealed hyperintensity on both Ti-weighted and T2-weighted images. The tumor was successfully excised. Histologically, the tumor was surrounded by a fibrous capsule, and cystic spaces were lined by mucus-producing cells or goblet cells. There was no cellular atypia or invasive growth. The histological diagnosis was MCA.

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We report a case of ameloblastoma of the mandible reconstructed with particulate cancellous bone marrow (PCBM) harvested from the tibia after the marginal resection of the mandibular bone. The patient was a 74-year-old woman who presented with left mandibular expansion, with no spontaneous pain. Panoramic radiography and computed tomography revealed a radiolucent lesion in the left side of the mandible. A preoperative biopsy resulted in a diagnosis of ameloblastoma. We performed marginal mandibular resection and reconstructive surgery using PCBM from the left tibia with a titanium plate and mesh under general anesthesia. We could harvest a sufficient amount of cancellous bone from the right tibia. The postoperative course was uneventful, with no complications. Reconstruction using PCBM may be an effective alternative procedure for repairing defects of the mandible.