The purpose of this study is to create a patient registry to collect and analyze post-510K approval information on subjects treated endoscopically with the CryoSpray Ablation™ System.

The proposed registry is a prospective, multi-center study of patients that are being currently undergoing CryoSpray Ablation™. It will also be used to catalogue retrospective data from records of patients already treated with the device. A maximum of 40 investigational sites will participate in this study.

Inclusion Criteria:

• The study population consists of patients who are being treated, or were treated, with the CryoSpray Ablation™ System for malignant or pre-malignant conditions of the esophagus, including:

  • Barrett's esophagus with or without dysplasia
  • Squamous dysplasia of the esophagus
  • Esophageal cancer, any stage

Exclusion Criteria:

• Subjects with esophageal lesions whose pathology was not one of the above.
• Subjects with one of the above conditions who were not treated with the CryoSpray Ablation™ System.

The study population consists of patients who are being treated, or were treated, with the CryoSpray Ablation™ System for malignant or pre-malignant conditions of the esophagus, including:

1. Barrett's esophagus with or without dysplasia
2. Squamous dysplasia of the esophagus
3. Esophageal cancer, any stage, as evidenced by histology.