Coristoma óseo lingual. Nuevo caso de una entidad extremadamente infrecuente / Lingual osseous choristoma. New case of an extremely uncommon entity

Los osteomas constituyen un grupo de tumores óseos benignos que se localizan habitualmente en el cráneo y los huesos de la región facial, siendo rara su presencia en los tejidos blandos de la cavidad oral. También se les conoce como coristomas óseos, ya que están compuestos por tejido óseo maduro de aspecto normal. En la cavidad oral, la localización más frecuente es el tercio posterior de la lengua y suele aparecer en mujeres con edades comprendidas entre la segunda y tercera década de vida. A pesar de que la mayoría de los pacientes presentan un curso asintomático, no es infrecuente que su motivo de consulta sea la sensación de cuerpo extraño y disfagia. Afortunadamente, los osteomas linguales tienen buen pronóstico, ya que una vez realizada la extirpación no hay descritos casos de recurrencia. Debido a su insólita presentación, con menos de 100 casos publicados en la literatura, se decide presentar este caso clínico. (AU)

Osteomas are rare benign tumors that can be located on the craniomaxillofacial skeleton, being unusual its presence in the soft tissues of the oral cavity. They are also known as osseous choristomas, as they consist of normal matured bone tissue. Osteomas of the tongue occur more frequently in women in their second or third decade and the most frequent location in the oral cavity is the posterior third of the tongue. Most patients are asymptomatic, though other forms of presentation could be complaining of the sensation of having a foreign body or, even, dysphagia. The fact that less than 100 cases have been reported in the literature, has motivated the presentation of this clinical case. (AU)

Epibulbar osseous choristoma: A clinical case and review of the literature. / Coristoma óseo epibulbar: caso clínico y revisión de literatura.

We present the case of a 3-year-old male child with an epibulbar bone choristoma. The patient presented with a hard consistency subconjunctival mass of 8×10mm in the superior-temporal quadrant of his right eye along with vascularisation and a long cilium of approximately 8 to 10mm that touched the corneal surface. The histopathology study showed the presence of trabeculae of mature, compact bone surrounded by fibrous tissue, as well as Havers channels with concentric rings of laminar bone without bone marrow, and with normal osteocytes which defined the diagnosis of epibulbar bone choristoma. Osseous choristoma is the rarest type of the ocular choristoma and should be considered as a differential diagnosis among paediatric epibulbar tumours.