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Home > E. Pathology by systems > Locomotory system > Bones > aneurysmal bone cyst

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aneurysmal bone cyst

Extraosseous aneurysmal bone cyst Extraosseous aneurysmal bone cyst Extraosseous aneurysmal bone cyst

Definition: Aneurysmal bone cyst (ABC) is a locally aggressive osseous lesion that typically occurs during the first two decades of life.

Variants

- soft tissue aneurysmal bone cyst (extraosseous aneurysmal bone cyst)
- solid aneurysmal bone cyst

Associations

- chondroblastoma (15704086)

Differential diagnosis

- osseous giant cell tumor
- giant cell reparative granuloma (giant cell reaction)
- brown tumor of hyperparathyroidism
- simple bone cyst (solitary bone cyst)
- telangiectatic osteosarcoma
- well-differentiated osteosarcoma

Cytogenetics

- 17p13 rearrangements (USP6)

  • translocation t(1;17) creating TRAP150/USP6 fusion
  • translocation t(3;17) creating ZNF9/USP6 fusion
  • t(5;17)(q33;p13) (17378626)
  • translocation t(6:17)(p21;p13) (11764383)
  • translocation t(9;17) creating OMD/USP6 fusion
  • translocation t(16;17)(q22;p13) creating CDH11/USP6 fusion
  • translocation t(17;17) creating COL1A1/USP6 fusion

Molecular biology

- variant translocations upregulate USP6 transcription by promoter swapping with the genes ZNF9, COL1A1, TRAP150 and OMD (15735689)

  • translocation t(1;17) creating TRAP150/USP6 fusion
  • translocation t(3;17) creating ZNF9/USP6 fusion
  • translocation t(6:17)(p21;p13) (11764383)
  • translocation t(9;17) creating OMD/USP6 fusion
  • translocation t(16;17)(q22;p13) creating CDH11/USP6 fusion
  • translocation t(17;17) creating COL1A1/USP6 fusion

- fusion gene in which the osteoblast cadherin 11 gene (CDH11) promoter region on 16q22 is juxtaposed to the entire ubiquitin-specific protease USP6 (Tre2) coding sequence on 17p13 (15026324, 15509545)

References

Keywords