case_images: PMC10773582_01
case_images: Axial (A) and coronal (B) preoperative MRI images showing abnormal signal foci in the renal pelvic region. (C) Ultrasound showing calcification in the left renal pelvis. Axial (D), coronal (E), and sagittal (F) contrast-enhanced CT images showing abnormal enhancement in the left renal pelvis.
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case_images: Urologic ultrasound showed a hypoechoic mass in the middle and lower part of the left renal collecting system, measuring approximately 2.2x1.1x1.1 cm ( Figure 1C ). Enhanced computed tomography (CT) was then performed, which showed abnormal enhancement with localized calcification in the left renal pelvis ( Figures 1D-F ). Magnetic resonance imaging (MRI) results showed abnormal signal foci in the left renal pelvic region ( Figures 1A, B ).
case_images: Puncture pathology showing the presence of small patches of spindle-shaped cells with interstitial vitreous degeneration and no mitotic image.
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case_images: Puncture pathology showed small patches of spindle cells with no mitotic image, favoring a benign lesion ( Figure 2 ).
case_images: (A) The renal pelvis was incised transversely between two branch vessels along the middle and lower pole of the left kidney. (B) A cauliflower-like lump was seen. (C) Partially collapsed lower pole of the left kidney. (D) Stripping and removal of the mass after incising the renal cortex.
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case_images: Freeing the renal clitoral vessels on the surface of the renal pelvis, the renal pelvis was incised transversely between two branch vessels along the middle and lower pole of the left kidney ( Figure 3A ). A cauliflower-like lump was seen ( Figure 3B ). A localized collapse at the lower pole of the kidney was seen; the renal cortex was incised from there and the residual mass was stripped and removed ( Figures 3C, D ).
case_images: Histological appearance and immunohistochemistry staining of the tumor. (A) Osteoblast-like cells in an osteoid core, HE staining. Immunohistochemistry staining reveals that the tumor cells are positive for WT-1 (B), Ki-67 (C), and STAB2 (D).
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case_images: The final pathology revealed ossifying renal tumor of infancy ( Figure 4 ).