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[Histopathologic study on intratemporal minimal facial nerve neurilemmomas]
1Second Clinical Medical College, Xi'an Medical University, Xi'an 710004.
Objective:
To explore the original location and pathologic behavior of facial nerve neurilemmomas.
Methods:
Human temporal bone slides from 815(1,526 ears) were histopathologically observed under light microscope.
Results:
Seventeen(1.84%) undiagnosed intratemporal facial nerve neurilemmoma with morphologic indications of Antoni type A were found. According to pathologic features, the intratemporal facial nerve neurilemmomas were classified as ingrowing facial nerve neurilemmomas (4 ears) which originated from the center of facial nerve, and outgrowing facial nerve neurilemmomas (13 ears) which originated from the perineurium at dehiscence of the facial nerve canal. Of the 17 tumors, two originated from the labyrinthine segment, twelve from the tympanic segment, one from second turn and two from vertical segment.
Conclusion:
It is of important pathologic and clinical significance to classify the intratemporal facial nerve neurilemmomas into outgrowing and ingrowing types.
