title: Urinary tract obstruction due to extramedullary plasmacytoma: report of two cases.
abstract: Extramedullary plasmacytomas (EMP) rarely occur during the course of multiple myeloma (MM). Most frequent reported sites are superior respiratory airways, pleura, lung, lymph nodes, skin, subcutaneous and soft tissues, testicles and liver. EMP involving the urinary tract are very uncommon and have been ill-described in the literature. We report two unusual cases of obstructive urinary tract EMP revealing a relapse of MM after allogeneic stem cell transplantation. Clinicians must be aware that EMP may be responsible for urinary tract obstruction even in the absence of medullary progression of MM.
authors.affiliation: Nephrology Department , Université Paris Descartes, AP-HP , Necker Hospital.
authors.forename: Naïke
authors.initials: N
authors.lastname: Bigé
authors.affiliation: Haematology Department , Saint Louis Hospital.
authors.forename: Bertrand
authors.initials: B
authors.lastname: Arnulf
authors.affiliation: Nephrology Department , Université Paris Descartes, AP-HP , Necker Hospital.
authors.forename: Aurelie
authors.initials: A
authors.lastname: Hummel
authors.affiliation: Radiology Department.
authors.forename: Eric
authors.initials: E
authors.lastname: De Keyser
authors.affiliation: Pathology Department.
authors.forename: Virginie
authors.initials: V
authors.lastname: Royal
authors.affiliation: Haematology Department , Université Paris Descartes , AP-HP , Necker Hospital , Paris.
authors.forename: A
authors.initials: A
authors.lastname: Buzyn
authors.affiliation: Nephrology Department , Université Paris Descartes, AP-HP , Necker Hospital.
authors.forename: Fadi
authors.initials: F
authors.lastname: Fakhouri
keywords: bladder; multiple myeloma; plasmacytoma; urinary tract