The left hand aisle has two altars. The first, unusually with a very small polygonal mensa, has a painting by Giovanni da San Giovanni of The Annunciation in an elaborate gilded Baroque wall-frame over a grille. The idea here is that a private Mass could be said for a small number of nuns in the chamber on the other side. To the right of the altar is an access door (now permanently closed), over which is a 17th century fresco of two putti.

(Another photo of the painting here)