Primary B-cell lymphoma of the CNS in an infant.

Primary B-cell lymphoma of the CNS is a rare tumor representing 0.2 to 2% of all primary CNS malignancies. The usual age of presentation is in the 4th to 6th decades. Sporadic cases have been reported in the pediatric population. However, even in this age group the tumor is extremely rare under the age of 5. This is a report of a 3-year-old child with primary lymphoma of the CNS.