Histopathology annual review edition for 2021.

Gastrointestinal (GI) pathology has become a vast and complicated subject, and it is appropriate that this Annual Review Issue (ARI) is restricted to the upper gastrointestinal tract. For a tubular organ some 24 cm long in the adult, the number of different inflammatory pathologies afflicting the oesophagus is relatively restricted but these authors describe, with aplomb, more recently recognised diseases and concepts. Infective pathology is always important in the GI tract and Nicole Panarelli, from New York City, has produced an excellent review of those infective pathologies that particularly afflict this area. [Extracted from the article]