“…3 Although prior trauma may contribute to some cases of venous aneurysms, 2,3,8,9 their ultimate etiology remains unclear, 6 with several congenital, inflammatory, or degenerative wall weakness theories proposed to explain them. 8,[10][11][12][13] In our case, the pathologic findings suggested a venous angiomatous formation. The anomalies found in the mus- cular layer have been reported by others in the wall of venous aneurysms 1,6,7,14,15 and may represent a congenital wall weakness.…”