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Vol. 39. Issue 2.
Pages 125-127 (April - June 2006)
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Vol. 39. Issue 2.
Pages 125-127 (April - June 2006)
Casuística
Mixoma odontogénico
Odontogenic myxoma
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2834
Leslie Kilmurray, Luis Ortega, Julián Sanz-Esponera
Servicio de Anatomía Patológica. Hospital Clínico San Carlos. Universidad Complutenses de Madrid
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Resumen
Introducción

El mixoma odontogénico es un tumor poco frecuente de la mandíbula, benigno pero localmente invasivo. Se caracteriza por mostrar escasas células de morfología fusiforme o estrellada con abundante estroma mixoide. Aunque la histogénesis es controvertida se cree que se origina a partir de la papila dental en desarrollo.

Caso clínico

Se presenta el caso de un mixoma odontogénico afectando el maxilar inferior derecho de un paciente varón de 27 años de edad. Histológicamente el tumor estaba compuesto fundamentalmente por células de tamaño y morfología uniformes inmersas en una matriz mixoide. Las técnicas de inmunohistoquímica utilizadas muestran positividad uniforme con vimentina y parcheada con actina muscular específica. Las células son negativas para desmina, proteína S-100 y citoqueratinas. El índice proliferativo (medido con Ki-67) es muy bajo (inferior al 1%).

Palabras clave:
mixoma odontogénico
mandíbula
inmunohistoquímica
Summary
Introduction

Odontogenic myxoma is an uncommon tumor of the jaws, benign but locally invasive. It consists of scarce cells with a spindle or star shape embedded in a myxoid stroma. This tumor is considered to originate from dental papilla of the developing teeth though there is some controversy about its histogenesis.

Case presentation

An odontogenic myxoma from the right lower jaw in a 27-year old male patient is reported. Microscopically the tumor is composed mainly of relatively uniform cells lying in a myxofibroid background. Immunostaining of tumor cells shows uniform positivity with vimentin and patchy staining with muscle specific actin. Cells are negative for keratin, desmin and S-100 protein. The proliferative index (measured by Ki-67) is very low (lesser than 1%).

Key words:
odontogenic myxoma
jaws
immunohistochemistry

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