MASC is a lipid-rich tumour containing large lipid droplets covered by adipophilin. This finding can be included among its defining immunohistochemical features, and possibly represents lactation-like secretory differentiation. Strong expression of STAT5a and cytoplasmic p63 in MASC reinforces this hypothesis.

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Objective. To present 4 new cases of oral leiomyomatous hamartomas (OLH), describing its clinical, microscopical, and immunohistochemical features, and a literature review. Methods. The OLH cases were retrieved from the files of 2 Brazilian and 1 Peruvian oral pathology services. Clinical data were obtained from the pathology reports. Microscopical features were reviewed, and immunohistochemical reactions were performed. A review of the English-language literature about OLH was done. Results. The sample was composed of 3 females (4-, 10-, and 15-year-old) and 1 male (3-year-old). Three cases affected the dorsum of the tongue and one the incisive papilla, and all presented sessile or pedunculated smooth nodules. Microscopically, the lesions were composed of varying-size fascicles of smooth muscle fibers in a fibrous connective tissue background. Immunohistochemistry revealed positivity of the smooth muscle bundles for myogenic markers. The English-language literature review revealed 38 OLH cases reported, most were congenital or diagnosed up to 5 years old. The main locations were tongue and anterior maxilla. Conclusions. Although OLH is a rare lesion, it must be considered in the differential diagnosis of midline tongue or maxillary masses in newborns, infants, and youngsters.

Entre los tumores mandibulares, destacamos el ameloblastoma como una patología frecuente en el área maxilofacial, descrito como un crecimiento local persistente, agresivo e invasivo con potencial de recidiva considerable, por lo que la integración clínica, imaginológica e histopatológica nos dirige a establecer diagnósticos para definir el tratamiento quirúrgico. Con el conocimiento de técnicas quirúrgicas maxilofaciales, indicadas para la ablación de tumores en el Maxilar inferior empleamos la mandibulectomía parcial o segmentaria con reconstrucción inmediata y posterior rehabilitación con implantes, demostrando efectividad en el tratamiento. La combinación de injertos autólogos ofrece: contención y estabilidad que da la cortical externa de calota craneana hacia el particulado de cresta ilíaca, y el volúmen óseo obtenido es brindado por el injerto particulado para facilitar la instalación de implantes.

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