CASE HISTORY / CLINIC:
Patient having severe pains in the upper teeth for several days. Pains radiate into the maxillary sinus. Incipient swelling of the left cheek.


FINDINGS:
The contrast-enhanced CT image of the visceral skeleton (upper left image) demonstrates a partially fluid-filled and partially air-filled mass around the angle of the jaw. A soft-tissue component can also be seen ventrally.
The ventral bony margin is partially not demonstrable in the bony window scan (upper right image).
The bony window scan at a more inferior position (lower image) reveals a retained tooth.


DIAGNOSIS:
Infected retention cyst in the upper jaw.


DIFFERENTIAL DIAGNOSIS:
Cysts of a different origin



Web resources:

1) Amersham Health
2) Medecoinfo