Decoy cells and malignant cells coexisting in the urine from a transplant recipient with BK virus nephropathy and bladder adenocarcinoma.

The search for decoy cells (DC) in urine is widely used as screening for BK virus (BKV) reactivation in transplant recipients. BKV cytopathic effect of DC must not be confused with high-grade urothelial carcinoma. This report presents a case of coexistence of DC and malignant cells in the urine from a transplant recipient with BKV-associated nephropathy (BKVN) and bladder adenocarcinoma.

Immunoglobulin crystal-storing histiocytosis in a pleural effusion from a woman with IgA kapa multiple myeloma: a case report.

Background: Crystal-storing histiocytosis (CSH) is a rare disorder occurring in patients with lymphoproliferative diseases, predominantly multiple myeloma and low grade B-cell lymphoma. This report presents the first case of CSH diagnosed on pleural fluid from a patient with multiple myeloma (MM).

Case: A 79-year-old women with IgA kappa MM underwent thoracocenthesis and thoracic drainage because of a pleural effusion.