Partial Nephrectomy for a Massive Sporadic Renal Angiomyolipoma: Case Report and Review of the Literature

Figure 2

Macroscopic image showing a large circumscribed tumor with extensive hemorrhage (a). Photomicrographs show, arising from the kidney (lower left), an unencapsulated triphasic tumor (upper right) composed of mature adipose tissue (arrow), dystrophic vasculature (arrow head), and smooth muscle (clear arrow) (b). The smooth muscle cells appear to emanate from the wall of an irregular, thick-walled blood vessel (arrow) (c) and are characterized by oval to spindle cells with pale eosinophilic cytoplasm and regular nuclei with small nucleoli (perivascular epithelioid cells) (d).

(a)

(b)

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