Spontaneous Modifications of Contrast Enhancement in Childhood Non-cerebellar Pilocytic Astrocytomas

Overview

Journal Neuroradiology

Specialties Neurology
Radiology

Date 2012 Jan 31

PMID 22286205

Citations 17

Authors

Simona Gaudino

Francesca Quaglio

Chiara Schiarelli

Matia Martucci

Tommaso Tartaglione

Maria Rosaria Gualano

Giuseppe Maria Di Lella

Cesare Colosimo

Affiliations

Soon will be listed here.

Abstract

Introduction: Pilocytic astrocytoma (PA) is classified by the World Health Organization as a grade I tumor. Magnetic resonance imaging (MRI) is the gold standard in the diagnosis and follow-up of this neoplasm, and assessment of contrast enhancement (CE) pattern is essential. The purpose of this study was to investigate CE changes of non-cerebellar PA (n-C PA) stable in size with serial MRI.

Methods: Nine hundred and twelve MRI exams of 140 children with histologically proven PA were retrospectively reviewed. Patients were chosen for study inclusion if they were off therapy, without neurofibromatosis type 1, and without dimensional changes of tumor/residual tumor. In patients with CE changes, tumor size and CE size were calculated with a cross product. Descriptive statistics were calculated for continuous variables; effects of possible factors influencing changes of contrast-enhanced areas were tested.

Results: Of 39 n-C PA satisfying the inclusion criteria, 12 showed CE changes in terms of appearance/increase or disappearance/decrease of CE areas. Three of these 12 PA were infratentorial and nine supratentorial. There were no significant correlations between age, gender, tumor localization, tumor size, and modification of CE areas.

Conclusion: In our experience, n-C PA may show variable CE over time in the absence of tumor/residual tumor dimension change. We recommend that CE fluctuations alone cannot be considered an indicator of tumor progression/regression.

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