Figure 4From: Soft-tissue perineurioma of the retroperitoneum in a 63-year-old man, computed tomography and magnetic resonance imaging findings: a case report Structure of the mass. (a) Cut surface of a well-circumscribed, whitish, solid mass. (b) Hypocellular tumor composed of spindle cells with elongated nuclei and slender cytoplasmic processes in prominent myxoid stroma.Back to article page