Bilateral temporomandibular joint ganglion cysts: CT and MR characteristics.

Fig. 1.Axial MR images at level of mandibular condyles. nounced during Valsalva. There was no evidence of adenopathy or bruit, nor was there evidence of paresthesia or motor deficit. Oral examination was normal. MR imaging demonstrated bilateral cystic structures just anterior and lateral to the mandibular condyles (Figs. 1 and 2). CT before and after right temporomandibular joint arthrography revealed opacification of a cystic structure anterior to the right temporomandibular joint (Fig . 3). Postsialogram CT of the right parotid region revealed no intrinsic parotid abnormalities and no evidence of opacification of the previously described cystic structure (Fig . 4 ). During surgical exploration a cystic structure was dissected and excised . The right parotid gland was not dissected, as this cystic structure was anatomically separate from the gland . The patient 's postoperative course was uneventful, and he was discharged 2 days after this procedure. The final pathologic report was consistent with a ganglion cyst of the right temporomandibular joint.