Massively retracted tympanic membrane with middle ear effusion on the left

Massively retracted tympanic membrane with middle ear effusion on the leftA middle ear effusion is understood as an accumulation of fluids in the middle ear space. Possible fluid types are:

Secretions (Seromucotympanum, respectively, acute serous otits media)

Pus (acute purulent otitis media)

A middle ear effusion is always accompanied by a conductive hearing loss. The tympanogram shows a flat curve.