A Case Report of a Maxillary Antrolith Surrounded by Fibrous Tissue

Abstract

Maxillary antrolith is a rare disease of the maxillary sinus, which is formed by the deposition of mineral salts around an endogenous or exogenous foreign body as a core. We report a case of a maxillary antrolith that originated from a core that developed in the maxillary sinus.
The patient was a woman in her 30s. Imaging examination revealed a round radiopacity in the maxillary sinus with hard tissue-like radiopacities that were not contiguous with adjacent dental roots, and the root was curved to avoid the radiopacity. The patient underwent excisional surgery under general anesthesia. A white mass with bone-like hardness was observed in the maxillary sinus. The lesion was clearly circumscribed from the surrounding tissue. Histopathological findings showed acidophilic hard tissue at low magnification. A round shaped substance was seen, with hard tissue surrounding the substance as a core （5-10μm） at high magnification. Although cholesterol clefts, which were seen when cells were damaged, and hard tissue were formed around the core-like material, no cell proliferation was observed, and foreign body reactions were scarce. It was thought that hard tissue was added around these materials, forming a mass in the maxillary sinus.