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Chondroblastoma of the apex portion of petrousal bone.

Dran G, Niesar E, Vandenbos F, Noel G, Paquis P, Lonjon M

Department of Neurosurgery, Gui de Chauliac Hospital, 2 av Emile Bertin Sans, 34000, Montpellier, France, g-dran@chu-montpellier.fr.

BACKGROUND: Skull chondroblastoma is extremely rare. We described in this study the first case of petrousal bone apex chondroblastoma. METHODS: The tumor occurred in a 12-year-old girl and was revealed by left hypoacusis, vertigo, and walking instability. Computerized tomography scan depicted well-demarcated and osteolytic lesion of the left petrousal bone just before the internal acoustic meatus. The tumor was operated on by a subtemporal approach with a subtotal resection. Lesion recurred and was operated a second time by a combined approach subtemporal and translabyrinthine. This treatment was completed by radiotherapy. We used a combination of photon therapy and proton therapy. Outcome was good and free of recurrence 36 months after the second operation. CONCLUSION: Proton therapy can be particularly useful for skull base tumors frequently radioresistant and near very important structures. This case is the first one of a successful treatment by proton therapy for chondroblastoma recurrence.

Published 3 January 2007 in Childs Nerv Syst, 23(2): 231-5.
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