Spanish to English Medical Medical (general) gastrointestinal

Hola a todos -

I am translating a medical report on an elderly patient with multiple infirmities.

There is a whole section on his medical history and the phrase "lago gástrico" comes up.

Here is the section of the report:
GASTROSCOPIA:
Lago gástrico claro y mucoso.
Paredes elásticas con buena distensibilidad y motilidad Pliegues de distribución normal.
A nivel fundo corporal la mucosa es de aspecto endoscópico normal.
En el antro la mucosa presenta áreas de congestión y eritema en parches, con pérdida del brillo mucoso normal, sin erosiones, ulceras ni lesiones sospechosas de neoplasia. Se toman biopsias. Piloro central, sin lesiones.

Any help would be greatly appreciated!

Thanks!