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case_images: Non-contrast-enhanced computed tomography (CT) scan of the abdomen. A huge calcified mass like lesion similar to staghorn stone.
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case_images: There was also moderate hydronephrosis on the left (Figure 1).
case_images: DSMA scan shows non-functional left kidney.
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case_images: Renal function tests revealed a creatinine clearance of 62 mL/min, and the left kidney had negligible function on dimercaptosuccinic acid (DSMA) scan (Figure 2).
case_images: H&E study. (a): Kidney parenchyma infiltrated by a sarcomatous neoplasm. (b): Sarcomatous tumor cells with densely eosinophilic cytoplasm, lace-like osteoid, abd broad, irregular trabeculae. (c): Thin lace-like osteoid.
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case_images: No necrosis was noted (Figure 3).
case_images: IHC study. (a): positive immunostaining for CD10. (b): Negative immunnostaining for PAX8. (c): Negative immunnostaining for CK.
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case_images: The specimen was positive for CD10 and negative for PAX8 and cytokeratins (CK) (Figure 4).
case_images: Post-contrast CT scan. (a) muscle stranding of the abdominal wall indicated tumor invasion (asterisk). (b) Disappearence the fat plane between the mass and some loops of the intestine (arrow)suspicious of invasion. (c) infiltrated mass in the left psoas muscle (arrow).
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case_images: A similar 132 x 96 x 62 mm mass was noted in the left psoas muscle (Figure 5).