The interrenicular septum. A normal anatomical variant seen on DMSA SPECT.
SPECT imaging has been shown to identify additional defects when applied to Tc-99m DMSA scintigraphy. However, the nature of these defects is uncertain. They may be because of small scars or anatomical variants. The interrenicular septum (IRS) is a normal finding that may mimic a scar on ultrasound examination or tomography. In this study, it was found that the IRS may be identified on Tc-99m DMSA SPECT and that it was present in 32% of patients. Its characteristic appearance is a linear area of absent tracer uptake extending from the renal hilum into the parenchyma, usually anterosuperiorly. The preservation of renal cortical uptake differentiates it from a scar, which results in a defect in the rim of cortical Tc-99m DMSA accumulation.
Department of Nuclear Medicine, Prince of Wales Hospital, Sydney, Australia.
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Rossleigh
D002675:Child, Preschool; D005260:Female; D006801:Humans; D007668:Kidney / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D008297:Male; D015609:Organotechnetium Compounds; D012189:Retrospective Studies; D004113:Succimer; D019783:Technetium Tc 99m Dimercaptosuccinic Acid; D015899:Tomography, Emission-Computed, Single-Photon
D015609:Organotechnetium Compounds; D019783:Technetium Tc 99m Dimercaptosuccinic Acid; D004113:Succimer