1/14. Compression of the ulnar nerve in Guyon's canal by uremic tumoral calcinosis.We describe the case of a 70-year-old woman with chronic renal failure on haemodialysis presenting with an ulnar nerve compression in Guyon's canal secondary to uremic tumoral calcinosis. Excision of calcium deposits and external neurolysis of the ulnar nerve were successfully performed. Simultaneously, the hyperphosphatemia and hypercalcemia were corrected. The pathogenesis of this condition is different from primary tumoral calcinosis. Clinical and radiological features and therapy are discussed. Uremic tumoral calcinosis is an unusual etiology of ulnar nerve compression in Guyon's canal not previously reported in dialysis patients.- - - - - - - - - - ranking = 1keywords = canal (Clic here for more details about this article) |
2/14. ulnar nerve compression secondary to ulnar artery true aneurysm at Guyon's canal.This article presents a case of ulnar nerve compression at the Guyon's canal caused by a true aneurysm of the ulnar artery secondary to blunt trauma. The duration of follow-up was one year. SETTING: Hospitalized care. A 27-year-old man who worked in an office fell on to a gravel path landing on his out-stretched right hand. decompression of the ulnar nerve was made by simple ligation of the damaged artery and resection of aneurysm. MEASURES: Histological examination. The sensory symptoms disappeared two days after the operation. At one year after surgery, the patient was completely asymptomatic. There was no residual cold intolerance. Simple ligation of the damaged artery and resection of aneurysm resulted satisfactory. It seemed to be a safe method in this case. ulnar nerve compression due to a true aneurysm of the ulnar artery in the Guyon's canal is rarely described in the literature.- - - - - - - - - - ranking = 1keywords = canal (Clic here for more details about this article) |
3/14. Ulnar neuropathy caused by a lipoma in Guyon's canal--case report.A 74-year-old female presented with a 3-month history of compression neuropathy of the right ulnar nerve in Guyon's canal. magnetic resonance imaging and ultrasonography revealed the location of the mass lesion. Surgical exploration discovered a lipoma pressing against both the ulnar nerve and the ulnar artery. The mass was extirpated. The postoperative course was uneventful with good function recovery.- - - - - - - - - - ranking = 0.83333333333333keywords = canal (Clic here for more details about this article) |
4/14. Atypical compression of the deep branch of the ulnar nerve in Guyon's canal by a ganglion. Case report.A 61-year-old woman with an ulnar claw-finger deformity but no sensory loss had a cystic lesion excised from Guyon's canal. The ganglion was in zone 1 of the canal, which is associated with both motor and sensory deficit, but on this occasion it caused motor dysfunction alone.- - - - - - - - - - ranking = 1keywords = canal (Clic here for more details about this article) |
5/14. ulnar nerve compression by an anomalous muscle following carpal tunnel release: a case report.We describe the acute development of ulnar nerve compression following carpal tunnel release in a patient with an accessory palmaris longus muscle. Although anomalous muscles in the wrist are relatively common and may produce ulnar nerve compression, this particular occurrence following carpal tunnel release has not been previously described in the literature. We theorize that the compression of the ulnar nerve proximal to Guyon's canal was caused by increased tension along the long axis of the anomalous accessory palmaris longus muscle as a consequence of transverse carpal ligament division.- - - - - - - - - - ranking = 0.16666666666667keywords = canal (Clic here for more details about this article) |
6/14. Ulnar tunnel syndrome--an unusual cause.We describe a case of anomalous muscle belly at Guyon's canal causing ulnar tunnel syndrome with sparing of the motor branch and hypothenar muscles.- - - - - - - - - - ranking = 0.16666666666667keywords = canal (Clic here for more details about this article) |
7/14. Surgical management of Guyon's canal syndrome, an ulnar nerve entrapment at the wrist: report of two cases.Guyon's canal syndrome, an ulnar nerve entrapment at the wrist, is a well-recognized entity. The most common causes that involve the ulnar nerve at the wrist are compression from a ganglion, occupational traumatic neuritis, a musculotendinous arch and disease of the ulnar artery. We describe two cases of Guyon's canal syndrome and discuss the anatomy, aetiology, clinical features, anatomical classification, diagnostic criteria and treatment. It is emphasized that the knowledge of both the surgical technique and anatomy is very important for a satisfactory surgical result.- - - - - - - - - - ranking = 1keywords = canal (Clic here for more details about this article) |
8/14. Handlebar palsy--a compression syndrome of the deep terminal (motor) branch of the ulnar nerve in biking.We describe 3 patients who developed a severe palsy of the intrinsic ulnar supplied hand muscles after bicycle riding. Clinically and electrophysiologically all showed an isolated lesion of the deep terminal motor branch of the ulnar nerve leaving the hypothenar muscle and the distal sensory branch intact. This type of lesion at the canal of Guyon is quite unusual, caused in the majority of cases by chronic external pressure over the ulnar palm. In earlier reports describing this lesion in bicycle riders, most patients experienced this lesion after a long distance ride. Due to the change of riding position and shape of handlebars (horn handle) in recent years, however, even a single bicycle ride may be sufficient to cause a lesion of this ulnar branch. Especially in downhill riding, a large part of the body weight is supported by the hand on the corner of the handlebar leading to a high load at Guyon's canal. As no sensory fibres are affected, the patients are not aware of the ongoing nerve compression until a severe lesion develops. Individual adaptation of the handlebar and riding position seems to be crucial for prevention of this type of nerve lesion.- - - - - - - - - - ranking = 0.33333333333333keywords = canal (Clic here for more details about this article) |
9/14. Demyelinating focal motor neuropathy of the ulnar nerve masquerading as compression in Guyon's canal: a case report.ulnar nerve-innervated intrinsic muscle weakness, in the absence of sensory complaints or deficits, usually is the result of compression at the ulnar nerve in zone II of Guyon's canal. In rare instances the problem is not caused by a compressive neuropathy but by a demyelinating focal motor neuropathy. Demyelinating neuropathies have been well documented in the neurologic literature but they have received little attention in the hand surgery literature. We report on one such case and the importance of differentiating the 2 neuropathies. Although surgery often is necessary for a compressive neuropathy it is contraindicated for a demyelinating neuropathy.- - - - - - - - - - ranking = 0.83333333333333keywords = canal (Clic here for more details about this article) |
10/14. Anomalous flexor digiti minimi brevis in Guyon's canal.In an adult male cadaver, the flexor digiti minimi brevis, a muscle of the hypothenar eminence, was found to arise from the superficial transverse septum (between the superficially placed flexor carpi ulnaris, palmaris longus, and flexor carpi radialis muscles, and the deeply placed flexor digitorum superficialis muscle) in the distal fourth of the flexor aspect of the left forearm. The muscle exhibited two strata of muscle fibers at its origin. The superficial stratum was a thin layer of transversely running fibers confined to the forearm, which has not been previously reported. The deep stratum, a thick layer of longitudinally running fibers, formed the bulk of the muscle. It traversed Guyon's canal superficial to the ulnar nerve and vessels to reach the hypothenar eminence. Its course through Guyon's canal could be a cause for ulnar tunnel syndrome. The ulnar nerve trunk innervated not only the anomalous flexor digiti minimi brevis muscle, but also abductor digiti minimi and palmaris brevis. This may be due to the common phylogeny of these three muscles from the same muscle mass.- - - - - - - - - - ranking = 1keywords = canal (Clic here for more details about this article) |
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