Spindle cell lesions

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Spindle cell lesions are seen frequent enough that one ought to have a solid approach to 'em.

General DDx

Spindle cells should make think:

  • Nerve.
  • Muscle.
    • Smooth.
    • Skeletal.
  • Other.

Malignant fibrous histiocytoma

Work-up (MSH):

  • CD34 - GIST, angiosarcoma, solitary fibrous tumour/hemangiopericytoma.
  • S100 - neural marker, sensitive for malignant melanoma.
  • Desmin - smooth muscle.
  • MIB-1 - proliferation.
  • CD99 - small round cell tumours, considered "slutty", i.e. non-specific, by Dr. Fletcher; useful if membranous stain pattern = Ewing sarcoma/PNET.
  • Bcl-2.
  • PGP 9.5.
  • SMMS - smooth muscle.
  • Caldesmon - muscle.
  • PDGFR - GIST.
  • DOG-1 - GIST (membranous, cytoplasmic),[1] normal pancreas (islets),[1] associated with BRCA1.

Others:

  • Beta-catenin - a small subset of soft tissue lesions:
    • Desmoidtype fibromatosis (~70%), solitary fibrous tumour & endometrial stromal sarcoma (~40%), synovial sarcoma (~30%).[2]

See also

References

  1. 1.0 1.1 Ardeleanu C, Arsene D, Hinescu M, et al. (October 2009). "Pancreatic expression of DOG1: a novel gastrointestinal stromal tumor (GIST) biomarker". Appl. Immunohistochem. Mol. Morphol. 17 (5): 413–8. doi:10.1097/PAI.0b013e31819e4dc5. PMID 19417627.
  2. Ng TL, Gown AM, Barry TS, et al. (January 2005). "Nuclear beta-catenin in mesenchymal tumors". Mod. Pathol. 18 (1): 68–74. doi:10.1038/modpathol.3800272. PMID 15375433.