Abstract
The loss of parenchyma in the lower pole of a kidney with a duplicated collecting system may mimic a mass on urography (“the nubbin sign”). Computed tomographic findings of this entity are diagnostic. The diagnosis may be difficult to make using sonography alone.
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Curtis JA, Pollack HM: Renal duplication with a diminutive lower pole: the nubbin sign.Radiology 131:327–331, 1979
Privett JTJ, Jeans WD, Roylance J: The incidence and importance of renal duplication.Clin Radiol 27:521–530, 1976
Schaffer RM, Shih YH, Becker JA: Sonographic identification of collecting system duplications.J Clin Ultrasound 11:309–312, 1983
Horgan JG, Rosenfield NS, Weiss RM, Rosenfield AT: Is renal ultrasound a reliable indicator of a nonobstructed duplication anomaly?Pediatr Radiol 14:388–391, 1984
Carter AR, Horgan JG, Jennings TA, Rosenfield AT: The junctional parenchyma defect: a sonographic variant of renal anatomy.Radiology 154:499–502, 1985
Kay CJ, Rosenfield AT, Taylor KJW, Rosenberg MA: Ultrasound characteristics of chronic atrophic pyelonephritis.AJR 132:47–49, 1979
Hulnick DH, Bosniak MA: “Faceless kidney”: CT sign of renal duplicity.J Comput Assist Tomogr 10:771–772, 1986
Zaontz MR, Pahira JJ, Wolfman M, Gargurevich AJ, Zeman RK: Acute focal bacterial nephritis: a systematic approach to diagnosis and treatment.J. Urol 133:752–757, 1985
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Blair, D., Rigsby, C. & Rosenfield, A.T. The nubbin sign on computed tomography and sonography. Urol Radiol 9, 149–151 (1988). https://doi.org/10.1007/BF02932647
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DOI: https://doi.org/10.1007/BF02932647