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CC BY-NC-ND 4.0 · Asian J Neurosurg 2025; 20(03): 605-609
DOI: 10.1055/s-0045-1806859
Case Report

Recurrent Calcifying Pseudoneoplasm of the Neuraxis in Meckel's Cave with Cyst Extending into the Cerebellopontine Cistern after Resection of the Cystic Component: A Case Report

Ryuta Yamada
1   Department of Neurosurgery, Asahi University Hospital, Gifu, Japan
,
Hiroki Kobayashi
1   Department of Neurosurgery, Asahi University Hospital, Gifu, Japan
,
Yuichi Nomura
1   Department of Neurosurgery, Asahi University Hospital, Gifu, Japan
,
Naoki Oka
1   Department of Neurosurgery, Asahi University Hospital, Gifu, Japan
,
Jouji Kokuzawa
1   Department of Neurosurgery, Asahi University Hospital, Gifu, Japan
,
Yasuhiko Kaku
1   Department of Neurosurgery, Asahi University Hospital, Gifu, Japan
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Funding None.
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Abstract

Calcifying pseudoneoplasms of the neuraxis (CAPNON) are rare non-neoplastic calcified lesions that can occur throughout the entire neuraxis. Cranial nerves may be involved in skull base lesions. Surgical resection usually has a good prognosis, with only a few cases of recurrence reported in the relevant literature. We experienced a recurrent case of CAPNON in Meckel's cave extending to the cerebellopontine cistern with involvement of the trigeminal nerve after initial resection of the cystic part of the lesion. A 48-year-old man presented with a 4-year history of right-sided ptosis. Magnetic resonance imaging revealed a calcified lesion arising in Meckel's cave, with a cystic lesion extending to the cerebellopontine cistern. The cystic part of the lesion was excised during the initial surgery using the right lateral suboccipital approach. However, the cystic lesion regrew to its preoperative size within 23 months. The right extradural subtemporal approach was used to successfully remove both the calcified mass in the right Meckel cave and the cystic lesion extending to the right cerebellopontine cistern during the resection of the lesion. The patient's neurological symptoms resolved postoperatively. CAPNON was identified during the histopathological examination. This report describes a rare case of CAPNON in Meckel's cave with a unique clinical course. After the first operation, cystic lesions recurred in the cerebellopontine cistern, but they were successfully treated by a second operation.

Keywords

calcifying pseudoneoplasms of the neuraxis - CAPNON - Meckel's cave - Cyst


Publikationsverlauf

Artikel online veröffentlicht:
25. März 2025

© 2025. Asian Congress of Neurological Surgeons. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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