Lung tumor
Other malignancies
Synovial sarcoma

Author: Deepali Jain, M.D. (see Authors page)

Revised: 4 January 2017, last major update September 2012

Copyright: (c) 2003-2017, PathologyOutlines.com, Inc.

PubMed Search: pulmonary synovial sarcoma
Cite this page: Synovial sarcoma. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/lungtumorsynovialsarcoma.html. Accessed January 20th, 2017.
Definition / General
  • Rare tumor in lung
  • Associated with chest pain, hemoptysis, dyspnea, cough, fever
  • Rarely is cystic (Am J Surg Pathol 2010;34:1176)
  • 40 - 55% die of disease after 20 years followup, due to metastases to bone, CNS, liver, or invasion of adjacent organs
  • Tumors with SYT-SSX2 fusion proteins have 89% 5 year survival vs. 42% for tumors with SYT-SSX1 fusion protein
Case Reports
Micro Description
  • Monophasic spindle cells or biphasic with epithelial and spindle cell component
  • Monophasic tumors have compact fascicles of hyperchromatic spindle cells with hemangiopericytoma-like areas, often punctuated by small arteries and capillaries in an irregular distribution
  • Poorly differentiated tumors have small, round blue cells resembling Ewing sarcoma / PNET
  • Rarely rhabdoid features
Micro Images

Images hosted on other servers:

H&E, BCL2, CD99, CD117

Poorly differentiated tumor: H&E and vimentin

Positive Stains
Negative Stains
Molecular / Cytogenetics Description
  • t(X;18)(p11.2;icq11.2)
  • Produces either SYT-SSX1 or SYT-SSX2 fusion genes
Differential Diagnosis