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Biomedical subjects

J Guerra

Publications and source records attributed to J Guerra.

At least 73 records · Page 4Linked to original sources
PubMed1983

Hand and wrist arthropathies of hemochromatosis and calcium pyrophosphate deposition disease: distinct radiographic features.

Radiographic features of hand and wrist involvement in 26 patients with hemochromatosis and in 26 patients with idiopathic calcium pyrophosphate dihydrate (CPPD) crystal deposition disease were compared. Two radiologists independently examined the radiographs without knowledge of the specific group to which the patient belonged. The results of this study clearly establish that structural joint diseases in the two disorders are not identical. Characteristic findings allow the radiologist to favor one diagnosis over the other. These radiographic differences indicate that the arthropathy of hemochromatosis is related to factors additional to the presence of CPPD crystals, specifically, the more prevalent narrowing of the metacarpophalangeal joint spaces, including those in the fourth and fifth digits, peculiar hook-like osteophytes on the radial aspect of the metacarpal heads, and less prevalent separation of the scaphoid and the lunate.

Adult↗
PubMed1983

Intracapsular pressure monitoring during arthrographic evaluation of painful hip prostheses.

Aspiration-arthrography with continuous monitoring of intraarticular pressure and volume was performed on 10 consecutive patients with painful total-hip arthroplasties. Five of these patients demonstrated clinical and arthrographic evidence of adhesive capsulitis, a condition that was associated with a dramatic rise of intraarticular pressure as increasing amounts of contrast material were introduced. The precise etiology of adhesive capsulitis is not clear.

Adult↗
PubMed1982

Melorheostosis of the axial skeleton with associated fibrolipomatous lesions.

Two patients with melorheostotic-like lesions of the axial skeleton are described. In each case adjacent soft tissue masses containing both fatty and fibrous tissues were evident. The presence of such soft tissue tumors as well as other soft tissue abnormalities in melorheostosis emphasizes that the disease should not be regarded as one confined to bone. The precise pathogenesis of the osseous and soft tissue abnormalities in melorheostosis remains obscure.

Adult↗
PubMed1981

Spinal vacuum phenomena: anatomical study and review.

"Vacuum" phenomena relate to the accumulation of gas, principally nitrogen, in crevices within the intervertebral disk or vertebra. Their appearance does not uniformly indicate "degenerative" disk disease (primary intervertebral osteochondrosis), as gaseous collections may accompany other processes (vertebral osteomyelitis, Schmorl node formation, spondylosis deformans, vertebral collapse with osteonecrosis) affecting the disk and adjacent vertebral bodies. The location and appearance of the "vacuum" phenomena are helpful indicators as to the precise nature of the spinal disorder.

Humans↗
PubMed1981

Synovial plicae of the knee.

Synovial plicae are remnants of synovial tissue found in the adult knee which in early development partitioned the joint into three compartments. The most common types are the suprapatellar, medial patellar, and infrapatellar plicae. Although they are normally found in up to 60% of adult knees, plicae may become pathologically thickened and symptomatic, resulting in the "plicae syndrome." In addition, persistence of these structures in their embryonic form as complete septa may give rise to a variety of intra-articular compartmental syndromes, medial patellar, and infrapatellar plicae. Although they are normally found in up to 60% of adult knees, plicae may become pathologically thickened and symptomatic, resulting in the "plicae syndrome." In addition, persistence of these structures in their embryonic form as complete septa may give rise to a varietellar, medial patellar, and infrapatellar plicae. Although they are normally found in up to 60% of adult knees, plicae may become pathologically thickened and symptomatic, resulting in the "plicae syndrome." In addition, persistence of these structures in their embryonic form as complete septa may give rise to a variety of intra-articular compartmental syndromes. This report describes the anatomy and embryology of synovial plicae, as well as the clinical and radiographic findings associated with abnormal plicae in a variety of clinical entities.

Arthritis↗
PubMed1981

Angiographic findings in systemic necrotizing vasculitis.

Angiographic studies were carried out on 21 patients with systemic necrotizing vasculitis. Four basic arterial anomalies were found: (1) saccular microaneurysms appeared in 62% of the patients (2) arterial thrombosis was seen in 81% of patients; (3) arterial stenosis occurred in 81%; and (4) lumen irregularities occurred in 90%. Alterations in the renal vascular flow were also observed in accordance with changes in the cortical medullary differentiation, heterogeneous nephrogram, and prolonged washout. Two patients showed regression of microaneurysms after immunosuppressive therapy. We found angiography to be a low-risk technique of use for diagnosis and followup studies on vasculitis.

Adult↗
PubMed1981

Hemostasis in typhoid fever.

Abnormalities of hemostasis in vivo and in vitro were defined in a prospective study of patients with typhoid fever. In a group of 56 patients with a proven diagnosis of typhoid fever, hemostatic abnormalities were frequently found. In patients with normal clotting tests the fibrinogen level was found to be higher than in normal controls. This finding established a new normal level for patients with typhoid fever. Using this redefined normal level it was found that low fibrinogen was associated with other hemostatic abnormalities. Low fibrinogen levels in patients with typhoid fever are possibly the result of disseminated intravascular coagulation. This process affected 20% of our patients and was often of mild to moderate intensity. Clinically significant bleeding occurred in 18 patients and, in contrast to the results of previously published studies, was found to correlate with clotting abnormalities.

Adolescent↗
PubMed1980

Stress fractures of the inferior pubic ramus following hip surgery.

Fractures of the inferior pubic ramus developed in 5 patients following hip surgery. In at least 4 patients the bony abnormality was related to a stress infraction. Stress fractures of the obturator ring are not commonly reported; however, the authors suggest that they are sometimes overlooked as a postoperative complication that may lead to significant symptoms and a battery of unnecessary diagnostic examinations.

Aged↗
PubMed1980

Pseudomasses in the suprapatellar pouch at arthrography.

An arthrographic appearance, confidently diagnosed as synovial chrondromatosis, showed no abnormality at surgery. This experience prompted further investigation which led to the conclusion that a normal variant of the suprapatellar pouch may be confused with synovial masses. Single or multiple pseudomasses in this region may relate to the presence of an embryonic remnant of the synovial folds, the plicae synovialis. If the finding is looked for, with careful arthrographic technique and palpation under fluoroscopic control, along with correlation with the clinical findings, unnecessary arthrotomy may be avoided.

Adolescent↗