Polyomavirus (BK)-associated pleomorphic giant cell carcinoma of the urinary bladder: a case report.

This report describes the morphological features of a pleomorphic giant cell carcinoma with focal trophoblastic differentiation of the urinary bladder in a male, 12 years post living related donor renal transplant. The voided urine cytology demonstrated rare decoy cells admixed with markedly atypical urothelial cell clusters, papillae and giant cells. Cystoprostatectomy demonstrated a nodular mass involving the trigone and right lateral-posterior wall, adjacent to the ureteral orifice. Hematoxylin-eosin stained sections showed two synchronous malignancies: (a) pleomorphic giant cell carcinoma with focal trophoblastic differentiation of the urinary bladder, metastatic to the omentum and (b) prostatic adenocarcinoma, Gleason score 3+4=7, involving the right prostate lobe. Strong diffuse expression of polyomavirus large T antigen was demonstrated in the primary and metastatic pleomorphic giant cell carcinoma, supporting a possible role for polyomavirus (BK) in the oncogenetic pathway. The prostatic adenocarcinoma was negative for polyomavirus large T antigen. Our findings of p63, CK7 and CK903 expression in pleomorphic giant cell carcinoma suggest that the tumor is of urothelial derivation. This is the first report describing the morphological features of urinary bladder pleomorphic giant cell carcinoma with trophoblastic differentiation, positive for polyomavirus large T antigen, arising in the background of BKV reactivation.

Giant cell carcinoma causing rapidly progressive respiratory failure as the presenting feature of AIDS.

The incidence of lung cancer has been increasing among HIV-positive patients. The majority of these cases were in patients previously diagnosed as HIV-positive and treated with highly active antiretroviral therapy (HAART). Here, we report a 56-year-old male patient with lung cancer, who was diagnosed as HIV-positive after the onset of neck pain and lumbago and thus, was not treated with anti-AIDS therapy. The patient developed rapidly progressive and fatal respiratory failure. Autopsy demonstrated giant cell carcinoma of the lung responsible for carcinomatous lymphangitis. This case highlighted the possibility that pulmonary carcinogenesis in HIV-positive patients is not necessarily associated with HAART therapy.

Primary cutaneous giant cell plasmacytoma in an organ transplant recipient: a rare presentation of a posttransplant lymphoproliferative disorder.

Posttransplant lymphoproliferative disorder (PTLD) is comprised of a spectrum of lymphoid diseases, ranging from early lesions, such as plasmacytic hyperplasia, to monomorphic neoplasms, including plasmacytoma-like lesions. Although PTLD may involve a variety of organs, primary cutaneous PTLD is rare. We report a unique case of Epstein-Barr virus (EBV)-positive primary cutaneous giant cell plasmacytoma developed 5 years after renal/pancreatic transplant in a 55-year-old male patient. The patient received local radiotherapy without reduction in immunosuppression and responded well. A review of the literature identified additional 49 cases of primary cutaneous B-cell PTLD, including 18 cases of plasmacytoma-like lesions. Primary cutaneous B-cell PTLD usually presents years after transplantation, has male preponderance, tends to occur on extremities, is frequently EBV-associated, and predicts a favorable clinical outcome. Unlike PTLD in general, in which EBV-positive cases usually occur earlier than EBV-negative ones, the longer presentation interval in the cutaneous PTLD seems to be uncorrelated to EBV status. Compared with other subtypes of cutaneous B-cell PTLD, plasmacytoma-like lesions have an increased male preponderance and tendency to present on the extremities. Although the majority of cases have been treated with reduction of immunosuppression, antiviral therapy and/or local radiotherapy, and a few with chemotherapy, the best therapeutic intervention for primary cutaneous B-cell PTLD remains to be further investigated with the analysis of more reported cases and large clinical trials.