Rituximab-induced serum sickness in the treatment of idiopathic membranous nephropathy.

We report a case of rituximab-induced serum sickness in a 50-year-old female with idiopathic membranous nephropathy. Presentation was characterized by a widespread rash 1 week after rituximab administration followed by fever and profound haemodynamic instability, mimicking sepsis. Symptoms resolved over 48 h, although adjunct antibiotics, steroids and inotropes were used. This case is notable for being the first reaction with rituximab for a renal indication as well as the severity of presentation.