Stellate Scar Sign or Starlike Scar Sign and Spoke-Wheel Pattern

Abstract

Renal oncocytoma is a benign tumor arising from the collecting ducts, which consists of eosinophilic epithelial cells. On tomograms oncocytomas are homogenous in density and in half of cases demonstrate a central scar with stellate form – the “stellate scar” sign or the “starlike scar” sign (↑).

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Renal oncocytoma is a benign tumor arising from the collecting ducts, which consists of eosinophilic epithelial cells. On tomograms oncocytomas are homogenous in density and in half of cases demonstrate a central scar with stellate form – the “stellate scar” sign or the “starlike scar” sign (↑). The scar may opacify intensely in the late phase of IV enhancement. Sometimes this scar looks like a wheel with spokes – the “spoke-wheel” pattern. Unfortunately, in practice it is impossible to distinguish oncocytomas with central scars from renal cell carcinomas with central zones of necrosis.