Reason: evaluate for cyst in Guyon's canal History: R wrist pain, ulnar nerve palsy We see no findings to account for the patient's ulnar nerve palsy, specifically we see no mass within Guyon's canal. There is a small nonenhancing collection of fluid signal intensity along the volar aspect of the capitohamate articulation near the carpometacarpal joint, likely representing a bilobed ganglion measuring approximately 7 mm in its greatest dimension. An additional small collection of fluid signal intensity is identified along the volar aspect of the base of the second metacarpal which also likely represents ganglion formation. These findings are not necessarily of any current clinical significance. There is mild edema and enhancement of the abductor pollicis brevis which is nonspecific and of uncertain etiology. We see no fatty atrophy of the muscle on T1-weighted images. The remainder of the musculature is unremarkable. Although this examination was not protocoled for detailed evaluation of the extrinsic ligaments of the wrist, we see no findings to suggest disruption of the scapholunate or lunotriquetral ligaments. The triangular fibrocartilage complex appears intact. No bone marrow signal abnormality is identified.
Tiny ganglia near the carpometacarpal joint, but no mass within Guyon's canal or other findings to account for the patient's wrist pain or ulnar nerve palsy.