<unk>  <unk> , black esophagus, or Gurvits syndrome is a rare<unk>  disorder.<unk>  defines itself with dark pigmentation of the esophagus, found during an upper gastrointestinal endoscopy. Pigmentation is usually black friable mucosa. The disorder is extremely rare, as only 89 patients over a span of 40 years have received this diagnosis. Specific study of the disorder's mortality rate is mentioned at 31.8%, but new research suggests mortality rates vary from 30–50%. The exact triggering mechanism for this disorder is still unknown, but is likely multifactorial.
Acute esophageal necrosis
Esophageal rupture
Esophageal stricture
Nutcracker esophagus
Lymphocytic esophagitis
Esophageal candidiasis
Herpes esophagitis
Diffuse esophageal spasm