Malignant lymphoma in a renal transplant recipient presenting as a solitary pulmonary nodule

Malignant lymphoma is the second most common type of tumor in renal transplant recipients. The commonest site is the central nervous system, which is involved in about 50% of the cases. This report described a 45-year-old female cadaveric renal transplant recipient, who presented with upper respiratory tract infection. Her chest radiograph showed a solitary pulmonary nodule. Open lung biopsy revealed a poorly differentiated malignant lymphoma of the histiocytic type. This case emphasizes the often atypical presentation of lymphoma in immunosuppressed patients.