[Giant petrosal meningioma invading the fourth ventricle: total removal of a recurrent tumor after eighteen years. Neurosurgical nuances. Case report and literature review].

Autor:	Karakhan VB; Blokhin National Cancer Research Center, Moscow, Russia., Prozorenko EV; Blokhin National Cancer Research Center, Moscow, Russia.; Sechenov First Moscow State Medical University, Moscow, Russia., Mitrofanov AA; Blokhin National Cancer Research Center, Moscow, Russia., Sevyan NV; Blokhin National Cancer Research Center, Moscow, Russia.; Sechenov First Moscow State Medical University, Moscow, Russia.
Jazyk:	ruština
Zdroj:	Zhurnal voprosy neirokhirurgii imeni N. N. Burdenko [Zh Vopr Neirokhir Im N N Burdenko] 2022; Vol. 86 (3), pp. 77-82.
DOI:	10.17116/neiro20228603177
Abstrakt:	The authors present a patient and neurosurgical nuances of total resection of recurrent meningioma of posterior surface of petrous bone 65´35´30 mm. The tumor captured two critical zones of posterior cranial fossa with unusual frontal growth and spread from the surface of petrous bone to the fourth ventricle. The neoplasm filled the ventricle without lesion of ependyma. Extensive fibrous meningioma of posterior surface of petrous bone was totally excised 18 years ago. MRI was annually carried out for 5 years. Surgical nuances that ensured total extraction of tumor without cytoreduction were as follows: 1) en-bloc resection of tumor from the fourth ventricle due to smooth surface of tumor and minimum number of adhesions with cerebellum; MR-confirmed CSF strip between the tumor edges and walls of the ventricle; no signs of hydrocephalus in subtotal ventricular tamponade; 2) unusual frontal tumor growth under 45º required appropriate angular traction of tumor with minimal rotation; 3) traction was followed by sequential appearance of 3 segments of tumor: petrous, apertural and ventricular; 4) topography of the area of lateral eversion of the fourth ventricle was established by identifying the narrowing (constriction) of tumor; 5) in extracting the tumor from the fourth ventricle, we performed minimal rotation to avoid damage to ventricular walls and lateral aperture due to difference between the larger and smaller diameters (by 6 mm) of ovoid ventricular segment of tumor; 6) no CSF leakage following appearance of ventricular segment (tumor enlargement) indicated integrity of ependyma of the fourth ventricle. Histological examination confirmed fibrous meningioma. Fast and complete regression of focal symptoms was observed after surgery. A 3-year follow-up after surgery revealed no signs of tumor recurrence.
Databáze:	MEDLINE
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