The radiology corner. Is an air-fluid level within a gastric ulcer a reliable roentgen sign of benignancy?

@inproceedings{Rk1977TheRC,
  title={The radiology corner. Is an air-fluid level within a gastric ulcer a reliable roentgen sign of benignancy?},
  author={Harned Rk and Wolf Gl},
  year={1977}
}

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