An olfactory groove schwannoma with a pseudocyst compressing the basal ganglia, internal capsule and optic tracts.
BACKGROUND
Olfactory groove schwannomas (OGSs) are extremely rare tumours, particularly in the paediatric population.


METHODS
A 13-year-old girl presented with two epileptic seizures, papilloedema and incomplete binasal quadrantanopia. Computed tomography (CT) and magnetic resonance imaging (MRI) demonstrated a large heterogeneously enhancing tumour of the anterior skull base with a prominent dorsal pseudocyst. Interestingly, the pseudocyst embraced the right ICA bifurcation and displaced the optic tracts, optic chiasm and optic nerves and the ipsilateral basal ganglia. The patient underwent surgery via the frontolateral approach, and the tumour was completely removed. The pseudocyst was opened, and its wall was partially resected. It subsequently resolved completely. Histopathological examination yielded the rare diagnosis of schwannoma of the anterior skull base.


CONCLUSIONS
Although extremely rare, olfactory groove schwannomas can be seen in paediatric patients. Our patient is the youngest ever reported with this histopathological diagnosis along with the formation of a large pseudocyst.
Department of Neurosurgery, 2nd Faculty of Medicine, Charles University and Motol University Hospital, V Úvalu 84, 150 06, Prague 5, Czech Republic. petr.liby@fnmotol.cz.
Petr
http://orcid.org/0000-0001-8392-795X
P
Liby
Department of Pathology and Molecular Medicine, 2nd Faculty of Medicine, Charles University and Motol University Hospital, Prague, Czech Republic.
J
J
Zamecnik
Department of Radiology, 2nd Faculty of Medicine, Charles University and Motol University Hospital, Prague, Czech Republic.
M
M
Kyncl
Department of Neurosurgery, 2nd Faculty of Medicine, Charles University and Motol University Hospital, V Úvalu 84, 150 06, Prague 5, Czech Republic.
M
M
Tichy
D000293:Adolescent; D005260:Female; D006801:Humans; D020772:Internal Capsule / Q000473:pathology; D009442:Neurilemmoma / Q000473:pathology* / Q000601:surgery; D065866:Optic Tract / Q000473:pathology; D019292:Skull Base Neoplasms / Q000473:pathology* / Q000601:surgery
Anosmia; Anterior skull base; Bilateral nasal quadrantanopsia; Case report; Frontolateral approach; Olfactory groove schwannoma