Pigmented villonodular synovitis of the pes anserine bursa.

@article{Maheshwari2007PigmentedVS,
  title={Pigmented villonodular synovitis of the pes anserine bursa.},
  author={Aditya Vikram Maheshwari},
  journal={The journal of knee surgery},
  year={2007},
  volume={20 3},
  pages={251-2; author reply 252}
}