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Biomedical subjects

D Resnick

Publications and source records attributed to D Resnick.

At least 613 records · Page 34Linked to original sources
PubMedDate not supplied

Osteonecrosis of the patella: imaging features.

Osteonecrosis of the patella, although uncommon, has become important to recognize because it can be a cause of pain in the knee. We describe the imaging manifestations of nontraumatic osteonecrosis of the patella in seven clinical cases. The lesions uniformly involved the superior aspect of the patella. Conventional radiography displayed increased radiodensity, subchondral radiolucent areas, and typical demarcation line surrounding the ischemic region. MR imaging and bone scintigraphy demonstrated the characteristic features of osteonecrosis. Recognition of the imaging findings of osteonecrosis involving the patella can preclude misdiagnosis and may obviate unproductive invasive diagnostic procedures.

Adult↗
PubMedDate not supplied

A huge osteoblastoma with aneurysmal bone cyst in skull base.

We reported a case of a huge osteoblastoma in the skull base of a young girl who had developed blindness in her right eye 1 year prior to examination. CT showed a large expansile bony lesion with eggshell margin over the skull base. MR imaging showed mixed solid and cystic parts with multiple fluid-fluid levels in the lesion. The optic chiasma and bilateral optic nerves were severely compressed by the tumor.

Adolescent↗
PubMedDate not supplied

Macrodystrophia lipomatosa. MR imaging in three patients.

Radiographs and magnetic resonance (MR) imaging of three patients with macrodystrophia lipomatosa are presented. Radiographs of involved extremities and digits demonstrated prominent soft tissues and bony hypertrophy. MR images showed hypertrophy of fatty tissue, cortical bone thickening and fatty infiltration of muscle.

Bone and Bones↗
PubMedDate not supplied

Rheumatoid nodules: MRI characteristics.

Rheumatoid nodules are not uncommon in patients with rheumatoid arthritis. Two patients with rheumatoid arthritis and rheumatoid nodules are described. The MRI characteristics and enhancement patterns of five nodules are examined.

Diagnosis, Differential↗
PubMedDate not supplied

Prevalence and patterns of tendon calcification in patients with chondrocalcinosis of the knee: radiologic study of 156 patients.

The presence or absence of tendon calcification was studied at six anatomic sites: Achilles, gastrocnemius, quadriceps, triceps (elbow), triceps long head (shoulder), and rotator cuff. The morphology of the calcifications was categorized in 156 patients with chondrocalcinosis in the knee. Achilles tendon, gastrocnemius, and quadriceps tendon calcifications were most common, ranging from 21%-25% of our patient population was thin linear bands. Triceps calcification at the elbow, rotator cuff calcifications, and long head of triceps tendon calcification were less common.

Adult↗
PubMedDate not supplied

Meniscal cysts causing bone erosion: retrospective analysis of seven cases.

Meniscal cysts of the knee are common and well evaluated by magnetic resonance (MR) imaging, a method that also reveals the frequently associated meniscal tear. Diagnosis of meniscal cysts with routine radiography is difficult, although bone erosions are reported as a very rare manifestation of such cysts. Our retrospective study describes seven patients in whom meniscal cysts were associated with adjacent erosion of bone.

Adult↗
PubMedDate not supplied

MR imaging of rotator cuff tears: is there a diagnostic benefit of shoulder exercise prior to imaging.

The purpose of this study was to determine if shoulder exercise prior to MR imaging accentuates findings related to rotator cuff tears. In 32 consecutive patients undergoing MR imaging to evaluate the rotator cuff, after routine MR examination, the joint was moved by active or passive exercise (circumduction, including abduction, if possible) in an attempt to redistribute any joint fluid. The exercise was performed according to pain tolerance and for no longer than 4 minutes. The coronal oblique fast spin-echo T2-weighted images of these patients performed before exercise were reviewed by consensus agreement of two musculoskeletal radiologists who were blinded to clinical information. The appearance of the rotator cuff tendons and the distribution of fluid in the glenohumeral joint were determined. The identical postexercise MR images then were placed alongside the corresponding preexercise MR images, and a direct comparison of findings was made with regard to any change in the appearance of the rotator cuff or joint fluid by consensus opinion of the same two radiologists. Five patients (five shoulders) could not perform exercise because of pain. In the remaining 27 patients (27 shoulders), changes in the location of joint fluid were seen when the preexercise and postexercise images were reviewed together, the diagnosis of partial rotator cuff tear (n = 8) was changed to normal in two cases, and the diagnosis of partial tear was made with more confidence in one case. The diagnoses of normal rotator cuff (n = 16) and complete rotator cuff tear (n = 3) were unchanged. Eight patients had arthroscopy; in each of these, the preexercise and postexercise images showed similar results, and proved to be correct surgically (six normal, one partial rotator cuff tear, and one complete rotator cuff tear). Although postexercise MR images show changes in the distribution of joint fluid when compared to preexercise images, the diagnostic benefits of the postexercise images in the analysis of the rotator cuff appear to be limited.

Exercise↗
PubMedDate not supplied

Myositis ossificans of the foot.

A 37-year-old woman with myositis ossificans of the left foot is reported. A faint density was seen on foot radiographs, whereas computed tomography images showed a rim of mineralization inferior to the second and third metatarsal bones. On short tau inversion recovery-weighted magnetic resonance images, a hyperintense lesion was demonstrated with hyperintensity extending to the surrounding soft tissues. The rim of ossification appeared hypointense. Other non-neoplastic soft tissue processes with bone formation such as pseudomalignant osseous tumor of soft tissues, florid reactive periostitis, and bizarre parosteal osteochondromatous proliferation occur more commonly in the foot than myositis ossificans. A differential diagnosis of these lesions including periosteal and parosteal osteosarcoma, periosteal chondroma, and osteomyelitis is discussed.

Adult↗
PubMedDate not supplied

Degenerative disease of the sacroiliac joint.

Analysis of 46 sacroiliac joints removed in toto at random during routine autopsies was undertaken to define the pathologic and radiographic alterations of this joint in middle-aged and elderly patients. Each joint was sectioned, photographed and radiographed and large microscopic slides were prepared. Sacroiliac osteoarthrosis resulted in progressive cartilage degeneration, particularly on the ilial side of the joint, with eventual cartilaginous fusion. Para-articular bony ankylosis was produced by bridging osteophytes on the anterior and inferior surfaces. Sacroiliac intra-articular bony ankylosis was confined to cadavers with ankylosing spondylitis. In some patients radiographic differentiation of osteoarthrosis and ankylosing spondylitis may require tomography.

Adult↗
PubMedDate not supplied

The plantar compartments of the foot: a roentgen approach I. Experimental observations.

The integrity of the plantar muscle compartments of the human foot were studied utilizing radiographic and anatomic techniques in an attempt to determine potential pathways for spread of soft tissue infection. One of three major plantar muscle compartments--medial, intermediate or lateral--in 24 unembalmed cadaveric feet was injected percutaneously under fluoroscopy with radiopaque Methyl-methacrylate using both manual and automatic injection techniques with pressure callibration. Following freezing, specimens were sectioned, radiographed, and dissected or partially macerated. Frequency and patterns of extravasation of contrast material were documented and recorded. The results obtained support the concepts that: a) there are three distinct plantar muscle compartments that are maintained by intermuscular septae; and b) there are potential communicating pathways provided by specific anatomic structures.

Foot↗
PubMedDate not supplied

Intervertebral disc abnormalities associated with vertebral metastasis: observations in patients and cadavers with prostatic cancer.

Abnormalities of intervertebral discs associated with vertebral metastasis from prostatic carcinoma are described in an investigation utilizing patient and cadaveric material. Radiographic and pathologic findings indicate that discal abnormality in this situation relates to three potential processes: intervertebral disc degeneration (intervertebral osteochondrosis); cartilaginous (Schmorl's) nodes; discal invasion by tumor. In most patients with vertebral metastasis, the adjacent intervertebral disc appears normal, a useful radiographic finding suggesting the presence of tumor rather than infection. Occasional patients with vertebral metastasis demonstrate roentgen abnormalities of the adjacent intervertebral disc indicating the occurrence of one or more of the above processes.

Humans↗
PubMedDate not supplied

Computed tomography of the normal radioulnar joints.

Computed tomography followed by sectional radiography and photography as performed on eight cadaveric specimens in order to define the anatomy and normal motion of both the proximal and the distal radioulnar articulations. Osseous landmarks were defined that allowed measurement of rotation at the glenohumeral, proximal radioulnar and distal radioulnar joints as well as rotation between humerus and radius and between humerus and ulna. Findings included the absence of independent ulnar rotation and the presence of normal translatory motion at the distal radioulnar articulation that may be misinterpreted as evidence of subluxation of the distal ulna.

Elbow Joint↗
PubMedDate not supplied

Computed tomography of the normal soft tissues of the wrist.

Computed tomography and sectional radiography and photography were performed on eight cadaveric wrist specimens in order to define the soft tissue structures of the normal wrist. Three specific levels were analyzed in detail: the levels of the distal radioulnar joint, of the pisotriquetral joint, and of the hook of the hamate. All soft tissues, with the exception of arteries and veins, were well demonstrated with computed tomography. In particular, the contents of both Guyon's canal and the carpal tunnel could be delineated. The position of the extensor carpi ulnaris tendon and sheath could also be evaluated. Contrast opacification of the flexor tendon sheaths and palmar synovial sacs did not contribute to the analysis. Computed tomography appears to be an important imaging modality in the evaluation of significant clinical problems, including the carpal tunnel and ulnar tunnel syndromes and subluxation of the extensor carpi ulnaris tendon.

Humans↗
PubMedDate not supplied

Intra-articular pressure determination during glenohumeral joint arthrography. Preliminary investigation.

Utilizing cadaveric and patient shoulders, normal values of intra-articular pressure were established during injection of increasing volumes of fluid within the glenohumeral joint. The characteristic biphasic pressures vs. volume curve that was normally observed was then compared with curves obtained in patients with a tear of the rotator cuff or with adhesive capsulitis. This method of examination should allow accurate objective assessment of the presence and severity of adhesive capsulitis.

Humans↗
PubMedDate not supplied

On the etiology and pathogenesis of porotic hyperostosis of the skull.

The 256 skulls and 66 skull fragments of the pre-Columbian Peruvian Indians in the Hrdlicka archeologic collection were examined for a porous bone lesion known as porotic hyperostosis. The age, sex, and geographic distribution, as well as the severity and pattern of involvement of the skull bones were noted in an attempt to define the etiology and the pathogenesis of the lesion. Porotic hyperostosis of the skull was present in 20% of the specimens and was probably caused by marrow expansion on the basis of iron deficiency. The lesion was more prevalent and severe among coastal dwellers; men and women were equally affected, and the parietal and occipital bones were the most frequently involved sites. Severe cases were observed only in infants and children, presumably because of limited marrow space and a special predilection for iron deficiency in infants, and of healing of the lesion in adults. Radiographic abnormalities included thinning of the outer table of the skull, diploic space widening, and a "hair-on-end" appearance. Sixty percent of all cases and 100% of severe cases demonstrated one or more of these findings.

Anemia, Hypochromic↗