RESUMO
Dermoid cysts are unusual developmental lesions occurring most frequently on the face, scalp, neck, and trunk, and represent <0.01% of all cysts of the oral cavity. Histologically, depending on the presence of adnexal structures and derivatives of germ layers, theses cysts are classified as dermoid, epidermoid, and teratoid cysts. Anatomically, they are divided into median genioglossal, median geniohyoid, and lateral cysts. Clinically, a distinction between supra and inferior type as well as between central and lateral type is proposed in relation to the mylohyoid muscle and the midline, respectively. Enucleation via intraoral and/or extraoral approach is the method of treatment. This cyst elicits a good prognosis with low malignancy and recurrence rate.
RESUMO
Peripheral odontogenic fibroma (POF) is a rare benign mesenchymal odontogenic neoplasm with or without odontogenic epithelium, which is considered to be the mucosal analogue of central odontogenic fibroma. Though peripheral odontogenic tumours are rare, comprising of only 0.05% of all biopsy specimens, POF is the most common peripheral odontogenic tumour, more common than its central counterpart by a ratio of 1.4: 1. In this report, we describe a healthy 40-year-old female who was seen with a recurrent POF of the left mandible.
RESUMO
Peripheral ameloblastoma (PA) is a rare, benign, extraosseous neoplasm of the odontogenic epithelium. It is an exophytic growth which is localized to the soft tissues overlying the tooth-bearing areas of maxilla and mandible. In most cases, there is no radiological evidence of bone involvement, except for cupping or saucerization of the underlying bone. Histologically, the PA consists of proliferating odontogenic epithelium that exhibits the same histomorphological cell types and patterns as seen in the intraosseous ameloblastoma. The PA is a slow growing and non-invasive, and recurrence is uncommon following excision, in contrast to central ameloblastoma which is locally invasive and can destroy large segments of the jaw. We report here a case of the plexiform type of PA.
RESUMO
Background: Peripheral ossifying fibroma (POF) is a lesion of gingival tissue that predominantly affects women and is usually located in maxilla, anterior to molars. The definitive diagnosis is established by histopathological examination, which reveals the presence of cellular connective tissue with focal calcifications. Objective: This study hypothesizes the histogenesis of POF by analyzing the diverse spectrum of mineralized components with a polarizing microscope. Materials and Methods: A retrospective study was undertaken which involved a detailed review of clinical, radiographic and histopathological features of 22 cases of POF, retrieved from departmental archives. These cases were subsequently stained with a histochemical stain (van Gieson) and observed under a polarizing microscope. Results: The study revealed that the most common age of occurrence was in second and third decades with a strong female predilection (73%), Interdental papilla of the maxillary anterior region was the most commonly afflicted site. About 90% cases showed no radiographic features.Histopathological examination showed that 73% cases consisted of a fibrocellular connective tissue stroma surrounding the mineralized masses. 50% mineralized masses comprised of woven bone, 18% showed combination of lamellar bone and cellular cementum, 18% showed only cementum (cellular and acellular), and remaining 13.6% exhibited a mixture of woven and lamellar bone under polarizing microscope. Conclusion: The study supports the theory that POF develops from cells of periodontal ligament (PDL)/periosteum as undifferentiated mesenchymal cells having an inherent proliferative potential to form bone or cementum, whose nature can be confirmed by polarizing microscope.