The clinicopathological features and immunohistochemistry profile of desmoplastic cerebral astrocytoma of infancy are discussed in a 4 month old male infant who presented with an increasing head circumference more pronounced in the last two weeks prior to admission to the University Pediatric Hospital. This is a rare tumor that occurs in infants within the first two years of life and it is characterized by a massive, often cystic, supratentorial lesion usually in the frontoparietal region. It has a biphasic histologic pattern with an astrocytic and desmoplastic component and a good prognosis after total or near total surgical resection. This patient represents the first case of desmoplastic cerebral astrocytoma of infancy diagnosed in the Puerto Rico Medical Center.
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