PubMed Health⌕ Search

Biomedical subjects

J Zeiss

Publications and source records attributed to J Zeiss.

47 records · Page 3Linked to original sources
PubMedDate not supplied

MR demonstration of an anomalous muscle in a patient with coexistent carpal and ulnar tunnel syndrome. Case report and literature summary.

An aberrant muscle is demonstrated by magnetic resonance (MR) imaging in a patient presenting with focal wrist swelling and compression neuropathy of median and ulnar nerves following 4 months of carpentry work. The muscle originated from the palmaris longus tendon and ulnar antebrachial fascia at the lower half of the forearm as a single belly, then diverged medially from palmaris longus tendon and bifurcated. Both portions of the split muscle extended into the distal ulnar tunnel or Guyon's canal. One segment joined with the abductor digiti minimi muscle and the other with the flexor retinaculum. MR was able to clearly delineate this hypertrophied, symptomatic muscle anomaly. It may be helpful when mass effect is suspected in either tunnel, or in patients with atypical work-related carpal tunnel syndrome with evidence of significant ulnar neuropathy for evaluation of underlying anomalous musculature. Normal MR images of the wrist are included for comparison and the literature is reviewed.

Carpal Tunnel Syndrome↗
PubMedDate not supplied

MR demonstration of anomalous muscles about the volar aspect of the wrist and forearm.

Magnetic resonance (MR) examination of 42 normal wrists was performed for evaluation of anomalous musculature. A total of 23 muscle variations were found. An accessory abductor digiti minimi was found in 10 wrists (24%), an absent palmaris longus was found in seven wrists (16%), a muscular palmaris longus tendon was found in three wrists (7%), a muscular flexor digitorum superficialis was found in two wrists (5%), and an aberrant lumbrical muscle originating from within the carpal tunnel was found in one wrist (2.4%). Such muscle variations can be distinguished by MR from other mass lesions at the wrist and a knowledge of their frequency, appearance, and location can be of help in this regard.

Adolescent↗
PubMedDate not supplied

Role of contrast enhancement in cerebral CT of carbon monoxide poisoning.

Postcontrast cerebral CT offers advantages as an adjunct to noncontrast CT in the evaluation of patients with carbon monoxide intoxication. It is of particular value when the noncontrast CT is normal with its ability to enhance otherwise isodense lesions. In this regard it can more accurately define the extent of the CNS insult and in some instances offer insight into the patient's eventual clinical outcome. Contrast medium was useful in this instance to more clearly elucidate typical injury to globus pallidus as well as rather unusual involvement of putamen.

Adult↗
PubMedDate not supplied

MR imaging of cerebral hemiatrophy.

Computed tomography has been the procedure of choice in evaluation of cerebral hemiatrophy, particularly in those instances where plain radiographic studies of the skull are nondiagnostic. Our experience suggests that magnetic resonance (MR) can easily accomplish the same task. Furthermore, by virtue of its exquisite soft tissue detail, MR can afford additional clarity and information with respect to relative gray-white matter loss, subarachnoid space size, gyral deformity, as well as highlighting asymmetry of the cerebral peduncles, internal capsules and the thalami.

Adolescent↗
PubMedDate not supplied

Myelolipoma of the liver: CT features.

A case of myelolipoma of the liver is reported. Computed tomography, ultrasound, and angiography of the lesion is described and compared with previous reports.

Adult↗
PubMedDate not supplied

MR imaging of the peroneal tunnel.

Fifteen ankles of five male volunteers, five female volunteers, three cadavers, and two patients suspected of injury were imaged. Sagittal localizer scans were obtained through mid- to lateral ankle followed by T1-weighted (echo time 20 ms, repetition time 600 ms) oblique axial sections paralleling the plane of the superior peroneal retinaculum. The anatomical structures seen on magnetic resonance images correlated closely with subsequently frozen and cut cadaver sections. The position of the peroneal tendons could be determined with absolute certainty, the posterior fibular anatomy could be defined, and the retinaculum could be identified in all cases. Though demonstrating considerable variability with respect to thickness, the retinaculum could be seen with sufficient confidence to establish its integrity or lack thereof in most instances. Magnetic resonance should therefore be considered as an aid in the diagnosis of acute peroneal ligament rupture when the clinical picture is not definitive.

Ankle↗
PubMedDate not supplied

Chronic bursitis presenting as a mass in the pes anserine bursa: MR diagnosis.

A case of chronic, nonspecific synovial inflammation presenting as a mass in the pes anserine bursa is demonstrated by MRI. The lesion was well demarcated and surrounded by a low intensity rim. On spin echo images it was homogeneous and of intermediate signal intensity, whereas on T2-weighted images it showed scattered areas of high signal producing a heterogeneous pattern. It is contrasted with a typical example of acute pes anserine bursitis, presenting as simple fluid within the bursa. The differential considerations vary accordingly between the acute and chronic forms of pes anserine bursitis, with the latter requiring differentiation from other forms of synovitis, synovial hemangioma, and synovial sarcoma. The MR features of these entities are reviewed as an aid in differential diagnosis.

Bursa, Synovial↗
PubMedDate not supplied

MRI of suprascapular neuropathy in a weight lifter.

Suprascapular neuropathy results from abnormal compression of the suprascapular nerve, typically at the suprascapular or spinoglenoid notch. This may be produced by either mass effect such as ganglion cyst or by certain repetitive shoulder motions producing wide scapular excursion (e.g., hyperabduction), which causes traction upon the nerve. Certain sports activities such as weight lifting predispose to this type of neuropathy. The clinical presentation is frequently not specific and the patient may be sent for MR evaluation to rule out rotator cuff tear or other more common shoulder abnormalities. This entity should be suspected if MR images demonstrate selective atrophy of the spinatus muscles with a structurally intact rotator cuff.

Adult↗
PubMedDate not supplied

MR demonstration of a persistent median artery in carpal tunnel syndrome.

The median artery of the forearm appears early in embryological development and normally involutes before birth. In rare cases, it persists into adult life. Although usually asymptomatic, it can be a cause for carpal tunnel syndrome (CTS). This report describes the MR appearance of a persistent median artery in a patient with CTS. The symptoms were relieved after resection of the aberrant vessel.

Adult↗
PubMedDate not supplied

Comparison of bone contusion seen by MRI in partial and complete tears of the anterior cruciate ligament.

OBJECTIVE: Bone contusions are frequently found in association with complete tears of the anterior cruciate ligament (ACL) and can be a helpful secondary sign in diagnosis. We compare the frequency, location, and significance of bone contusions in complete and partial ACL tears. MATERIALS AND METHODS: Twenty-nine patients with complete and 42 patients with incomplete tears of the ACL were examined by MRI for the presence of accompanying bone contusions within 1 month of injury. RESULTS: Bone contusions were found in 72% of the complete ACL tears but in only 12% of the partial tears. Of the partial ACL tears with accompanying contusions, 80% were high grade injuries that eventually went on to complete rupture within 6 months. Only 16% of the partial ACL injuries without bone contusion progressed to complete rupture at 1-2 year follow-up. There was no difference between the bone contusions of partial and complete tears in terms of general appearance and location. They were predominantly in the lateral compartment (90%) and had a specific predilection for the mid portion of the lateral femoral condyle and the posterior portion of the lateral tibial plateau, often occurring in tandem. CONCLUSION: Bone contusions occur with much less frequency in partial ACL tears than in complete tears but their presence in partial rupture favors a high grade tear that is likely to become complete.

Adolescent↗