Figure 4: Ganglioneuroma; (a) CT scan—a retroperitoneal mass abutting the intestine (yellow arrow), encasing the aorta (blue arrow); (b) Gross: Predominantly hemorrhagic and necrotic with peripheral viable tumor nodules. (c) Admixture of mature ganglion cells and Schwann cells on a collagenized stroma (H and E, 40X) (d) Large area of infarct-type necrosis and hemorrhage (H and E, 20X); (e) Synaptophysin expression by ganglion cells (IHC, 40X); (f) S100 expression by Schwann cells and ganglion cells (IHC, 40X). CT—Computed tomography; H and E—Hematoxylin and eosin; IHC— Immunohistochemistry