At the central crossing, the cupola dome has an Assumption fresco, considered the masterpiece of Giovanni Andrea Ansaldo, and restored later by Gregorio De Ferrari.

The third chapel is frescoed by St. Thomas Aquinas before Crucifixion by Domenico Piola, and Saint Diego cures a blind child by Simone Barabino; Martyrdom of St. Sebastian and the ceiling St. James baptizes pagans by G.B.

Carlone; on the walls, two episodes from the life of the saint, attributed to Claudius Francisco Beaumont; the vault is frescoed with Sant'Andrea adores the Cross by Domenico Fiasella.

The walls have paintings of a Presentation, Visitation and Prophet by Andrea Carlone; on the vault is frescoed St. Peter cures the lame by Gioacchino Assereto.

Carlone; on the altar in the front, a Madonna sculpture by Leonardo Mirano (1618); to the right, Saint Domenico Soriano, altarpiece by Tommaso Clerici.

On the main altar is a Crucifixion by Giacomo Antonio Ponsonelli; on the ceiling, Annunciation and Assumption, on the sidewalls, Presentation of Jesus in temple, all frescos by Giulio Benso; and Dispute with the doctors, painted from G.B.

In the left transept, in the niche over the altar is a San Pasquale adoring Holy Name, a polychrome work by Anton Maria Maragliano; in the ceiling and in the lunettes over the arched entrance to the far chapel, an Ascension and Supper at Emmaus, fresco by Giovanni Carlone.

Carlone; above a St. Lorenzo and St. Stefano, canvases by De Ferrari; on the outer vault are the damaged frescoes of Joshua crossing Jordan by G.B.