ArticleFrontiers in oncology2025
Unusual localization of pilocytic astrocytoma at the foramen of Monro mimicking a colloid cyst: a case report and literature review.
Article in Frontiers in oncology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Pilocytic astrocytoma is a circumscribed central nervous system (CNS) WHO grade 1 glioma that typically arises in the cerebellum or optic-hypothalamic pathways; intraventricular occurrence at or near the foramen of Monro is exceptional and can mimic a colloid cyst. Although tissue diagnosis is ultimately required, certain imaging features should keep neoplasm in the differential when a "colloid cyst" is suspected. We report a 22-year-old man with a well-circumscribed, non-enhancing mass at the foramen of Monro initially favored radiologically as a colloid cyst; radiology-pathology correlation after microsurgical resection established pilocytic astrocytoma with characteristic histology and a supportive immunophenotype. This case emphasizes that location and CT density are not pathognomonic and that surgical planning for equivocal lesions at the foramen of Monro should preserve a route for tissue confirmation to secure the correct diagnosis and guide management.
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