Pineal yolk sac tumor
Magnetic
resonance imaging of pineal region tumours. Pineal yolk sac tumour. Tumour involving the pineal gland (arrow) has slightly lobulated margins. The tumour is isointense to grey matter on sagittal T1-weighted image (a), heterogeneous with low and high signal on axial T2-weighted image (b) and shows contrast enhancement on axial T1-weighted image (c)
Pineal yolk sac tumors are rare type of extragonadal yolk sac tumors. They make up a small fraction of all intracranial germ cell tumors and an even small fraction of pineal masses overall.
CSF biochemistry may demonstrate elevated levels of alpha-fetoprotein (AFP) which is helpful but not diagnostic of yolk sac tumors, as both immature teratomas and embryonal cell carcinomas may also elevate AFP levels .
Epidemiology
Associations
As with other germ cell tumors, there may be an association with Down syndrome .
Pathology
In up to 50% of cases these tumors co-exist with other germ cell tumor histology .
Radiographic features
No specific imaging findings have been identified, with their appearance being similar to other germ cell tumors of the pineal region .
Siehe auch:
und weiter:
Assoziationen und Differentialdiagnosen zu Dottersacktumor der Glandula pinealis:
