There is a right submandibular space fluid collection as shown on @Key Finding 1 and @Key Finding 2. There are numerous dental caries and periapical lucencies throughout but the first and third right mandibular molars are carious (red arrows @Key Finding 4), have periapical lucensies (green arrow @Key Finding 4), and are immediately adjacent to the fluid collection. @Key Finding 3 suggests contiguity of the fluid collection with the carious portion of the third mandibular molar. For odontogenic abscesses like this, do not rely on the presence of rim-enhancement to call an abscess. Abscesses can be small or thin and as such, not show rim enhancement. Any fluid collection next to a carious tooth with periapical lucency should be considered an odontogenic abscess until proven otherwise.