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| Perinephric myxoid pseudotumor of fat in a young patient with a horseshoe kidney complicated by an obstructing renal calculus |
Ren Wei Liua,*( ),Gideon Tanb,Yi Ting Lima,Wei Jin Chuac,Amanda Chenga,Ying Mei Wonga,Victor Leeb,Thomas Thamboob
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a Department of Diagnostic Imaging, National University Hospital, Singapore
b Department of Pathology, National University Hospital, Singapore
c Department of Urology, National University Hospital, Singapore |
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Received: 20 September 2021
Available online:
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Corresponding Authors:
Ren Wei Liu
E-mail: REN_WEI_LIU@NUHS.EDU.SG
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CT and magnetic resonance imaging of the abdomen and pelvis with intravenous contrast, and pathology images showing microscopic features of the lesion. (A and B) Coronal and axial CT images showing a large obstructing calculus in the left renal pelvis (black arrows) and a low-density perirenal soft tissue mass with enhancing components (white arrowheads); (C) Horseshoe configuration of the kidneys (black arrows); (D) T2-weighted axial magnetic resonance imaging showing vascular flow voids suggestive of vessels (white arrowheads); (E) In-phase and (F) out-of-phase magnetic resonance imaging sequences showing signal drop-out consistent with macroscopic fat content; (G-I) Pathological analysis showing mature adipose tissue with areas of myxoid change, small blood vessels, and aggregates of chronic inflammatory cells, and there was no significant stromal atypia; (J) Scattered Touton-type giant cells present in the lesion, predominantly in the areas with chronic inflammation. CT, computed tomography.
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