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Phantom kidney: a CT correlation.

T Mochizuki1, M Charron, A N Shah

  • 1Department of Radiology, University of Pittsburgh School of Medicine.

Annals of Nuclear Medicine
|November 1, 1991
PubMed
Summary
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A phantom kidney, a kidney-like image on scans, can appear in patients without a kidney. Increased mesenteric vascularity, often after eating, was identified as the cause in a post-nephrectomy patient.

Area of Science:

  • Radiology
  • Nuclear Medicine
  • Vascular Imaging

Background:

  • The phantom kidney effect is an imaging artifact mimicking renal tissue on scintigraphy.
  • It is typically observed in patients with absent or removed kidneys, such as those with unilateral renal agenesis or post-nephrectomy status.

Observation:

  • This report details a phantom kidney observed during the angiographic phase of renal scintigraphy using 99mTc-dimercaptosuccinic acid (99mTc-DMSA).
  • The case involved a patient who had undergone a nephrectomy 14 years prior.

Findings:

  • Comparison with CT images revealed that increased mesenteric vascularity, potentially exacerbated by postprandial changes, was the cause of the phantom kidney.
  • While several conditions can cause this effect, increased mesenteric vascularity is identified as a frequent etiology.

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Implications:

  • Understanding the causes of the phantom kidney effect is crucial for accurate interpretation of renal scintigraphy.
  • Increased mesenteric vascularity should be considered in the differential diagnosis of phantom kidney, especially in postprandial states.