title: [Smooth muscle mesentery associated with Epstein-Barr virus (EBV). Report of a case in a child with a liver transplant under FK506 regimen].
abstract: Smooth-muscle tumors, benign and malignant, are increasingly recognized in children who are immunocompromised because of HIV infection and organ transplantation. We report a case of an EBV-associated smooth-muscle tumor, of unusual location arising in a seven-year-old post-transplant patient who was previously treated for a lymphoproliferative disease. Five years after liver transplantation, a mesenteric tumor was diagnosed. The tumor was composed of spindle cells with smooth-muscle features. Immunohistochemical analysis was positive for muscle-specific actin and desmin, negative for EBV latent membrane protein (LMP-1). In situ hybridization revealed nuclear EBV sequences. This case underlines the role of EBV infection in the development of unusual smooth-muscle tumors after organ transplantation. The evolution of these rare tumors is uncertain.
mesh_terms: D002648:Child; D004854:Herpesvirus 4, Human / Q000302:isolation & purification*; D006801:Humans; D007166:Immunosuppressive Agents / Q000627:therapeutic use; D016031:Liver Transplantation / Q000473:pathology*; D008297:Male; D008643:Mesentery / Q000473:pathology* / Q000821:virology; D010534:Peritoneal Neoplasms / Q000473:pathology* / Q000821:virology; D018235:Smooth Muscle Tumor / Q000473:pathology* / Q000821:virology; D016559:Tacrolimus / Q000627:therapeutic use