“…12 Cystic CFMs have been described in cats, cattle, dogs, horses, and monkeys. [1][2][3][4]6,7,10,11,[13][14][15][16][17][18]20 These malformations have been identified in various locations, have a wide range of wall features and epithelial linings, and have been named by various denominations ( Table 1). The esophageal cyst, in the foal reported herein, differed from those previously described in the veterinary literature in that the cyst was located in the duodenum and the cyst was lined by mixed squamous and simple cuboidal to columnar epithelium.…”