Ten uncommon and unusual variants of renal angiomyolipoma (AML): radiologic–pathologic correlation

Angiomyolipoma (AML) without visible fat: Ultrasound, CT and MR imaging features with pathological correlation

“…In the present study, all AML were T2-hypointense, which also supports results from previous studies [3,20,28,[30][31][32]. A minority of AML had microscopic fat on chemical-shift MRI.…”

“…Classic/triphasic AML is composed of dysmorphic blood vessels, smooth muscle and adipose tissue [1]. Macroscopic/bulk fat is the imaging hallmark of AML [3,4]. In 5 % of AML, there is insufficient fat to detect with imaging [5].…”

“…Renal angiomyolipoma (AML) is the most common mesenchymal renal neoplasm [1][2][3]. Classic/triphasic AML is composed of dysmorphic blood vessels, smooth muscle and adipose tissue [1].…”

Multiparametric MRI of solid renal masses: pearls and pitfalls

“…In these rare cases, the presence of synchronous calcification and fat within a renal mass favours the diagnosis of RCC. 31 Less concentrated areas of fat cells within AML result in a SI drop on CS-MRI and are referred to as areas of microscopic fat. Microscopic fat is also variably detected in the 5% of AML that do not contain sufficient amounts of fat to be characterized with conventional MRI (minimal fat or fat poor AML) 10,13,32 (Fig 2).…”

Evaluation of T1-Weighted MRI to Detect Intratumoral Hemorrhage Within Papillary Renal Cell Carcinoma as a Feature Differentiating From Angiomyolipoma Without Visible Fat

“…Of these findings, low T2-weighted signal intensity (SI) is a characteristic finding because of the abundant smooth muscle content of AML without visible fat [5,6,17,20,21]. Although the T2-weighted SI of AML without visible fat differs significantly from that of clear G e nit ou r i n a r y I m ag i ng • O r ig i n a l Re s e a rc h…”