Summary
The authors report a series of 6 patients with simultaneous occurrence of meningioma
and single brain metastasis, who underwent surgical removal with histological verification
of both lesions. The site of the primary tumor was the breast in 3 cases, the ovary
in one, the lung in one, and was unknown in one. Among the six patients, two had a
carcinomatous metastasis accidentally found into a meningioma after histological examination
of the meningiomatous mass. Two others had a brain metastasis in the cerebral parenchyma
surrounding the meningioma; both lesions were removed in an one-stage operation. Finally,
two patients, whose lesions were distant, first underwent removal of the brain metastasis,
whereas the meningioma was excised 10 and 13 months later. The pathogenetic relationships
between meningiomas and tumors of the female reproductive system are discussed. The
occurrence of a metastasis into a meningioma is a rather unusual event, which has
been described in 50 previously reported cases. The correct differential diagnosis
between meningioma and metastasis is very important in these patients. An intracranial
mass lesion occurring in patients with known malignant tumors elsewhere in the body
(mainly females with breast cancers) has a small but real chance of being a meningioma.
Zusammenfassung:
Die Autoren beschreiben 6 Patienten mit simultanem Auftreten eines zerebralen Meningeoms
und einer singulären Hirnmetastase, bei denen nach chirurgischer Entfernung beide
Läsionen histologisch nachweisbar waren. Der Primärtumor war in drei Fällen ein Mammakarzinom,
ein Ovarialkarzinom und ein Bronchialneoplasma in je einem Fall und unbekannt in einem
weiteren Fall. Bei 2 der 6 Fälle handelt es sich um zufällig entdeckte Metastasen
innerhalb eines Meningeoms und um zufällig bei der histologischen Untersuchung entdeckte
Metastasen innerhalb eines Meningeoms. Zwei weitere Patienten hatten die Hirnmetastase
im Hirnparenchym in der Umgebung der Meningeome und beide Läsionen konnten jeweils
während eines Eingriffs entfernt werden. Bei den zwei letzten Patienten lagen die
Läsionen entfernt voneinander, und hier wurde ein zweistufiges Vorgehen mit primärer
Entfernung der Hirnmetastase und sekundärer Meningeomoperation nach 10 und 13 Monaten
gewählt. Die pathogenetischen Beziehungen zwischen Meningeomen und Tumoren des weiblichen
Genitalsystems werden besprochen. Das Vorkommen einer Metastase in einem Meningeom
ist ein ziemlich seltenes Ereignis, das bisher erst 50-mal beschrieben wurde. Die
korrekte Differenzialdiagnose zwischen Meningeom und Metastase ist schwierig zu stellen.
Bei einer intrakraniellen Raumforderung bei Patienten mit bekanntem extrakraniellen
Malignom (vor allen Dingen bei Frauen mit Mammakarzinom) gibt es eine kleine, aber
realistische Chance, dass es sich um ein Meningeom handeln könnte.
Key words:
Meningioma - brain metastasis - breast cancer
Schlüsselwörter:
Meningeome - Hirnmetastasen
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Prof. Francesco Maiuri
Clinica Neurochirurgica
Università “Federico II” di Napoli
Via S. Pansini 5
80131 Napoli
Italia
Telefon: + 39/081/746-2576
Fax: + 39/081/7462594
eMail: frmaiuri@unima.it