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MR imaging characteristics of pilomyxoid astrocytomas
Atilla Arslanoglu1, Bayram Cirak, Alena Horska
1Department of Radiology, Johns Hopkins University, Baltimore, MD 21287, USA.
Insights
Pilomyxoid astrocytoma (PMA), a rare pediatric brain tumor, shows distinct MRI features including homogeneous T2 signal intensity and cerebrospinal fluid dissemination. These findings may aid in differentiating PMA from pilocytic astrocytoma (PA).
Area of Science:
- Pediatric neuro-oncology
- Neuroradiology
- Neuro-oncology
Background:
- Pilomyxoid astrocytoma (PMA) is a distinct pediatric brain tumor often misdiagnosed as pilocytic astrocytoma (PA).
- PMA presents unique histopathologic and clinical features, with a higher propensity for recurrence and cerebrospinal fluid (CSF) dissemination compared to PA.
- These tumors predominantly occur in the chiasmatic-hypothalamic region in young children.
Purpose of the Study:
- To analyze and characterize the magnetic resonance (MR) imaging findings of pilomyxoid astrocytoma (PMA).
- To compare the MR imaging features of PMA with those of typical chiasmatic-hypothalamic pilocytic astrocytoma (PA).
Main Methods:
- Retrospective analysis of MR imaging findings in four patients diagnosed with PMA.
- Comparative analysis of PMA MR findings against a cohort of typical chiasmatic-hypothalamic PA.
Main Results:
- MR imaging of PMA revealed chiasmatic or hypothalamic enhancing solid tumors associated with hydrocephalus.
- A highly homogeneous T2 signal intensity extending into deep white and gray matter was observed in PMA.
- Cerebrospinal fluid (CSF) dissemination was a notable finding in PMA.
Conclusions:
- Distinct MR imaging features, including homogeneous T2 signal intensity and CSF dissemination, are identified in PMA.
- These findings suggest potential utility in the differential diagnosis of chiasmatic-hypothalamic tumors.
- Further investigation with larger patient cohorts is necessary to validate these MR imaging findings for definitive diagnostic application.
Background And Purpose:
Pilomyxoid astrocytoma (PMA) is a recently described tumor that typically occurs in the chiasmatic-hypothalamic region in young children and has unique histopathologic and clinical characteristics. These tumors have been previously diagnosed as pilocytic astrocytoma (PA). PMA appears to have a higher rate of recurrence and CSF dissemination than typical PA.
Methods:
We analyzed MR findings in four patients with PMA and compared them with those of typical chiasmatic-hypothalamic PA.
Results:
MR findings of PMA were chiasmatic or hypothalamic enhancing solid tumor with hydrocephalus, highly homogeneous T2 signal intensity that extended into the deep white and gray matter, and CSF dissemination.
Conclusion:
Larger series are needed before the MR imaging findings of chiasmatic or hypothalamic enhancing solid tumor with hydrocephalus, highly homogeneous T2 signal intensity extending into the deep white and gray matter, and CSF dissemination can be used in the differential diagnosis of such tumors.
