RESUMO
Pediatric posterior fossa tumor (PFT) survivors who have been treated with cranial radiation therapy often suffer from cognitive impairments that might relate to IQ decline. Radiotherapy (RT) distinctly affects brain regions involved in different cognitive functions. However, the relative contribution of regional irradiation to the different cognitive impairments still remains unclear. We investigated the relationships between the changes in different cognitive scores and radiation dose distribution in 30 children treated for a PFT. Our exploratory analysis was based on a principal component analysis (PCA) and an ordinary least square regression approach. The use of a PCA was an innovative way to cluster correlated irradiated regions due to similar radiation therapy protocols across patients. Our results suggest an association between working memory decline and a high dose (equivalent uniform dose, EUD) delivered to the orbitofrontal regions, whereas the decline of processing speed seemed more related to EUD in the temporal lobes and posterior fossa. To identify regional effects of RT on cognitive functions may help to propose a rehabilitation program adapted to the risk of cognitive impairment.
RESUMO
PRIMARY OBJECTIVE: The aim of the study was the validation of the Deasy-Spinetta Questionnaire (DSQ) in 6-11 year olds with attention to the verification of three factors (learning difficulties, socialization and emotionality) and its application in children treated for cerebellar tumour. METHODS AND PROCEDURES: Twenty-nine children aged between 6-11 years were compared with 609 classmates. Teachers completed the DSQ. Patients were evaluated according to Wechsler Scales, the Purdue Pegboard and the International Cooperative Ataxia Rating scale. MAIN OUTCOMES AND RESULTS: In classmates, the DSQ factorial analysis showed three factors: learning, socialization difficulties and disturbing behaviour. Teachers reported more learning difficulties in patients than in classmates. Learning difficulties in patients were greater for mathematics and reasoning than for reading. Patients were described as less active, without evidence of autistic-like behaviour or irritability. The teachers' report of learning difficulties was significantly correlated with IQ scores, but not with neurological deficits. CONCLUSIONS: The proposed DSQ scores are interesting for the assessment of learning and behavioural difficulties in children treated for cerebellar tumours, as they provide complementary ecological information to that given by clinical and neuropsychological testing.