Letter to the EditorPublished 7 July 2026Low C1q alone should not be taken as diagnostic of acquired angioedema in a kindred with familial type 1 C1-inhibitor deficiency and overlapping systemic lupus erythematosusAmane Takagi · Saori Takamura · Tomoo FukudaJournal of Cutaneous Immunology and Allergydoi 10.3389/jcia.2026.16999
