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Fig. 3A. —37-year-old woman with doubling of serum creatinine level to 2.4 mg/dL 7 months after transplantation. Subsequent allograft nephrectomy confirmed small pararenal mass as posttransplantation lymphoproliferative disorder. Transverse sonogram shows small hypoechoic mass (cursors) near renal allograft. Although unusual, increased through transmission can be seen in solid masses. Echogenicity was not characteristic of simple lymphocele, and at 7 months after transplantation, hematoma is unlikely.