Calcified Amorphous Tumor of the Mitral Valve Causing Stroke: A Rare Case of Heart Tumor

Abstract Calcified amorphous tumor (CAT), first described in 1997, is a rare primary cardiac tumor with a lifetime incidence of 0.0017%–0.02%, accounting for approximately 2.5% of all primary cardiac tumors. CAT can be discovered incidentally or following neurological events. Here, we report a poststroke patient diagnosed with filamentous formation on the mitral valve. After the surgery, the biopsy identified it as a CAT. There was a debate among colleagues regarding the indication for surgery due to the small mass. The prevalence of valvular strands is from 5.5% in the general population to 40% in patients with unexplained stroke. The incidence of systemic embolism, including cerebral, retinal, and transient ischemic attacks, is reported at 53%. Considering the significant risk of cerebrovascular accidents associated with calcified amorphous or similar masses, especially in patients with a history of stroke, surgery remains the treatment of choice.