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We report the case of an 11-year-old boy who developedan anarithmetia in association with a left temporo-parietal tumor. His oraland written language were normal as well as his ability to judge magnitudes,process numbers, read operation signs and retrieve number facts. He had aspecific difficulty in performing the procedures of subtraction, especiallywhen it involved borrowing. These skills had been mastered before the presentillness. This case shows that the components of calculation can be dissociatedby brain lesions sustained during childhood, while arithmetic abilities arebeing acquired, thus reinforcing findings from developmental dyscalculias,that suggest a modular organisation of those skills during development. [ABSTRACT FROM AUTHOR]