Three cases of IgG4-RD complicated by splenic artery aneurysm: a complication of IgG4-RD?

Immunoglobulin 4-related disease (IgG4-RD) is known for its potential to affect nearly every organ, particularly a preference for large and middle-sized arteries when vascular involvement occurs. However, instances of splenic artery aneurysms are exceedingly rare with only two cases reported in the literature. We have summarised the clinical manifestations and laboratory characteristics of the three patients we reported along with the two patients previously reported. It is noteworthy that all five patients had involvement of the salivary glands and only one patient had other arterial involvement. The three patients we reported had no new organ onset or worsening of existing organ involvement and normal or not significantly elevated serum IgG4 levels when the artery aneurysm was identified. These aneurysms may be the result of vascular damage from prior involvement that was not recognised previously. The cases we reported here highlight a potential association between IgG4-RD and concurrent splenic artery aneurysms.