Telovelar approach for choroid plexus papilloma in the foramen of Luschka: a safe way using a neuromonitor.
BACKGROUND
Tumors located in the 4th ventricle are always challenging to neurosurgeons, especially tumors that extend to the cerebellopontine (CP) angle by the foramen of Luschka. Recent advances in microsurgical technique, including the neuromonitor and brainstem mapping, facilitate the surgical resection of tumors located in the foramen of Luschka. Herein, we present the use of the telovelar approach to access a choroid plexus papilloma within the right foramen of Luschka.


METHODS
A 28-year-old female presented with a history of sudden onset pulsatile headache and syncope twice without prodrome. The brain MRI revealed a 4th ventricular tumor deviated to the right foramen of Luschka and extending to the CP angle, 2.2 cm in diameter. There was no secondary hydrocephalus due to the patent foramen of Magendie and left foramen of Luschka. The patient underwent suboccipital craniotomy and C1 laminectomy with a telovelar approach. The right tonsil was elevated and teal chloride was incised from the foramen of Magendie to the telovelar junction. The tumor was centrally decompressed, and the margin was gently dissected from the brainstem and cerebellum peduncles. Functions of the facial, cochlear, glossopharyngeal, vagus, and hypoglossal nerves and nuclei were monitored. Mapping of the facial nucleus, ambiguous nucleus, and hypoglossal nucleus was also done. Total tumor removal was achieved and the histology showed choroid plexus papilloma. No functional neurological disorientation was observed after surgery.


CONCLUSIONS
The report demonstrated a safe and effective surgical approach to the foramen of Luschka. The approach yielded a better view of the foramen of Luschka laterally, and up to the middle cerebellar peduncle superiorly. Also, it minimized neural damage, and preserved the function of the cranial nerves and nucleus.
Department of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital, Taiwan, ROC.
Cheng-Chia
CC
Lee
Chun-Fu
CF
Lin
Tsui-Fen
TF
Yang
Sanford P C
SP
Hsu
Hsin-Hung
HH
Chen
Shao-Ching
SC
Chen
Yang-Hsin
YH
Shih
D000328:Adult; D002530:Cerebellopontine Angle / Q000473:pathology / Q000601:surgery; D016545:Choroid Plexus Neoplasms / Q000473:pathology / Q000601:surgery*; D003391:Cranial Nerves / Q000502:physiology; D003399:Craniotomy; D019299:Decompression, Surgical; D005260:Female; D020546:Fourth Ventricle / Q000473:pathology / Q000601:surgery; D006261:Headache / Q000209:etiology; D006801:Humans; D007796:Laminectomy; D008279:Magnetic Resonance Imaging; D019635:Neurosurgical Procedures / Q000379:methods*; D010212:Papilloma / Q000473:pathology / Q000601:surgery*; D011183:Postoperative Complications / Q000503:physiopathology