Lymph nodes - not lymphoma
Neoplasms (not lymphoma)

Author: Patricia Tsang, M.D. (see Authors page)

Revised: 26 June 2018, last major update December 2013

Copyright: (c) 2003-2018,, Inc.

PubMed Search: Angiomyolipoma[TI] lymph node

Cite this page: Tsang, P. Angiomyolipoma. website. Accessed October 20th, 2018.
Definition / general
  • Benign tumor associated with renal angiomyolipoma
  • Proliferation of adipose tissue, smooth muscle and thick walled vessels in variable proportions
  • Rare nodal involvement of renal angiomyolipoma likely due to multicentric tumor rather than metastasis (Int J Urol 2000;7:386, Arch Pathol Lab Med 1990;114:65)
  • Retroperitoneal and periaortic lymph nodes draining the involved kidney
  • Clonal process, consistent with neoplasm rather than hamartoma
  • Common progenitor cell differentiating into the 3 cell types (adipose tissue, smooth muscle and blood vessels) (Semin Diagn Pathol 1998;15:21)
Clinical features
  • Presents as renal mass with regional lymphadenopathy
  • May be associated with tuberous sclerosis
  • Fat poor angiomyolipoma can mimic renal cell carcinoma with nodal metastasis on radiograph
  • Indolent clinical course and slow growth
Case reports
  • Observation
  • Embolization of renal mass or renal conserving surgery
Microscopic (histologic) description
  • Haphazard adipose tissue and smooth muscle cells radiating from thick walled blood vessels
  • Ranges from sinusoidal involvement to massive replacement of nodal parenchyma
  • Smooth muscle may be epithelioid or pleomorphic
  • Infrequent mitoses
Microscopic (histologic) images

Images hosted on PathOut server:

Lymph node

Images hosted on other servers:

Perinephric node


Kidney - various images

HMB45+ smooth muscle cells in kidney

Positive stains
Molecular / cytogenetics description
  • Diploid DNA, consistent with benign behavior
Differential diagnosis