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Updated: May 16, 2026

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Published on: June 21, 2024
An unusual case of S-shaped malformation of the ipsilateral kidney with normal contralateral kidney
Amrith Raj Rao1, David Maudgil, Marc Laniado
1Department of Robotics and Minimally Invasive Surgery, Wexham Park Hospital, Wexham, Royal County of Berkshire, United Kingdom. urorao@gmail.com
Abstract:
Crossed ectopia is a rare congenital anomaly. S-shaped (sigmoid) kidney is one of the varieties of crossed ectopia that is associated with absence of any renal tissue in the contralateral renal fossa. S-shaped malformation of an ipsilateral kidney with presence of the contralateral kidney is an extremely rare condition and, to our knowledge, has been described only once before in the literature. We present the case and discuss the hypothesis for this rare malformation.
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