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Precursor B-cell lymphoblastic lymphoma (LBL) occurring as a primary bone tumor is a rare clinical presentation in children, and data regarding this condition are limited to small case series or a few individual case reports. We report two pediatric cases of precursor B-cell LBL of the bone. The tumor cells from bone biopsies of both patients were seen to be positive for leukocyte common antigen (LCA), terminal deoxynucleotidyl transferase, CD10, CD20 and weakly positive for CD99. Bone marrow studies were normal. They were treated according to the modified Berlin-Frankfurt-Münster acute lymphoblastic leukemia high-risk protocol. The first patient has completed treatment including local radiotherapy and has been disease free for the past 10 years. The second patient has recently completed treatment and shows good response. [ABSTRACT FROM AUTHOR]

We report two cases of mucoepidermoid carcinoma occurring as a second neoplasm following treatment for acute lymphoblastic leukemia. Both patients underwent parotidectomy as the primary treatment. One of them received irradiation in addition to surgery. We discuss the risk of developing MEC as a second malignancy, prognosis, and treatment options. [ABSTRACT FROM AUTHOR]