Navigating the diagnostic maze: A case presentation of C1q vasculitis mimicking hypocomplementemic urticarial vasculitis in a patient with systemic lupus erythematosus

Lupus. 2024 Jul;33(8):886-891. doi: 10.1177/09612033241253156. Epub 2024 May 8.

Abstract

In rare instances, patients with SLE may exhibit atypical clinical manifestations, such as Hypocomplementemic Urticarial Vasculitis, which can pose diagnostic challenges. Here, we present a case report of a 28-year-old female with a history of SLE with lupus nephritis clase IV who developed HUV-like symptoms, ultimately leading to a diagnosis of C1q Vasculitis. This case underscores the importance of considering C1q Vasculitis in SLE patients presenting with HUV-like features and highlights Rituximab as a promising therapeutic option for managing this rare condition.

Keywords: Systemic lupus erythematosus; cutaneous lupus; vasculitis.

Publication types

  • Case Reports

MeSH terms

  • Adult
  • Complement C1q* / deficiency
  • Diagnosis, Differential
  • Female
  • Humans
  • Lupus Erythematosus, Systemic* / complications
  • Lupus Erythematosus, Systemic* / diagnosis
  • Lupus Nephritis / complications
  • Lupus Nephritis / diagnosis
  • Lupus Nephritis / drug therapy
  • Rituximab* / therapeutic use
  • Urticaria* / diagnosis
  • Vasculitis* / diagnosis
  • Vasculitis* / drug therapy

Substances

  • Complement C1q
  • Rituximab