Angiomyolipoma classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor-In-Chief: Cafer Zorkun, M.D., Ph.D. [2], Faizan Sheraz, M.D. [3]

Overview

Angionmyolipoma may be classified according to radiologic appearance into 7 subtypes: classic angiomyolipoma, triphasic angiomyolipoma, fat poor angiomyolipoma, hyperattenuating angiomyolipoma, isoattenuating angiomyolipoma, angiomyolipoma with epithelial cysts, and angiomyolipoma in lymphangioleiomyomatosis.[1]

Classification

Angiomyolipoma may be classified as follows:[1]

Radiologic Classification Features

Classic angiomyolipoma

  • Abundant fat
  • Fat tissue in renal sinus

Triphasic angiomyolipoma

  • Mature adipose tissue
  • Dysmorphic blood vessels

Fat poor angiomyolipoma

  • Minimal fat tissue
  • Abundant smooth muscle component

Hyperattenuating angiomyolipoma

  • Abundant smooth muscle component
  • Hyperattenuating tissue

Isoattenuating angiomyolipoma

  • Scattered fat tissue
  • Smooth muscle component

Angiomyolipoma with epithelial cysts

  • Epithelium lined cysts
  • Fat poor

Angiomyolipoma in lymphangioleiomyomatosis

  • Atypical smooth muscle component
  • Cystic changes

References

  1. 1.0 1.1 Jinzaki M, Silverman SG, Akita H, Nagashima Y, Mikami S, Oya M (2014). "Renal angiomyolipoma: a radiological classification and update on recent developments in diagnosis and management". Abdom Imaging. 39 (3): 588–604. doi:10.1007/s00261-014-0083-3. PMC 4040184. PMID 24504542.


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