The case of a 25-year-old patient with a rare osteoblastoma-like osteosarcoma of the pars petrosa is discussed. CT scans (thin layers) showed a lytic, the skull basis-resorbing tumor with slight matrix calcification. MRI demonstrated a mainly signal intense tumor in T{sub 1}-weighted images with less signal intensity at its borders which showed an enhancing peripheral zone after use of a gadolinium-containing medium. (orig.) [Deutsch] Fallbeispiel eines 25jaehrigen Patienten mit seltenem, osteoblastomaehnlichem Osteosarkom der Felsenbeinregion. Im Duennschicht-CT Darstellung eines lytischen, die Schaedelkalotte resorbierenden Tumors mit zarten Tumorweichteil-Kalzifikationen. Im MRT Nachweis eines auch in T{sub 1}-Wichtung ueberwiegend signalintensen Tumors mit randstaendig weniger signalintensem Areal, welches Enhancement nach Gadolinium-Gabe zeigt. (orig.)

An osteoplasma-like osteosarcoma of the petrous bone; Osteoblastoaehnliches Osteosarkom des Felsenbeins

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