Center Brook Lopez, who has not missed a single game in his three seasons with the Nets, underwent successful surgery yesterday to remove calcium deposits and a bone mass in his upper right arm.

Lopez, several times during the latter part of the season, indicated that the deposits were painful whenever he was hit on the arm. Still, he averaged 20.4 points and 6.0 rebounds.

Brook was bothered this year by a bony lump that developed after he was hit in the arm early this year," said Nets team orthopedic Dr. Riley Williams III, who performed the operation with Dr, Andrew Weiland at the Hospital for Special Surgery in Manhattan. "The mass was successfully removed. A full recovery is expected, and Brook should be able to return to basketball activities in approximately six weeks."