摘要:

Radionuclide angiography (RNA) and cholescintigraphy were performed prospectively in 300 patients with suspected acute cholecystitis (AC). Of 79 patients with positive RNA, 63 had AC (80%). Positive RNA was seen in 23 of 26 cases with gangrenous AC (88%) while 12 of the 26 had a positive "rim" sign (46%). All 12 patients with a positive "rim" sign had positive RNA. The "rim" sign may be caused by increased perfusion. Five of 6 patients with positive RNA and "obstructive" pattern had AC (83%). Patients with negative RNA and positive cholescintigraphy had a positive predictive value of 54% (31/57), while those with positive RNA and positive cholescintigraphy had a positive predictive value of 85% (57/67). RNA showed increased perfusion to nonbiliary pathology such as liver abscesses and pyelonephritis. Positive RNA increases the predictive value of cholescintigraphy and may be useful to shorten cholescintigraphic examinations.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

An unusual pattern of Tc-99m IDA scintigraphy was observed in a 20-year-old woman with arteriohepatic dysplasia (Alagille syndrome). Although neither hepatic imaging with Tc-99m tin colloid nor radiographic CT revealed any morphologic abnormality in the liver, sequential hepatobiliary imaging demonstrated abnormal radiotracer behavior—specifically, differences in tracer clearance between the peripheral and central portions of the liver. Radioactivity was persistently retained in the periphery of the liver, but the central portion showed normal tracer clearance, resulting in a photopenic center surrounded by a hot peripheral rim on the later images. The gallbladder and small intestine appeared promptly. This image pattern may be characteristic for intrahepatic bile duct hypoplasia.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

In this case of prolonged fever and abnormal liver functions, dual tracer scintigraphy with ln-111 WBCs and Tc-99m SC led to a biopsy-proven diagnosis of severe acute toxic hepatitis (hepatocellular necrosis). Correlation of the Tc-99m SC scan findings with those previously reported for "pseudotumors" of the liver is discussed. A "pseudonormal" scan pattern is described for the ln-111 WBC scintigraphy. Discordance between ln-111 WBC and Tc-99m SC scintigraphy in this clinical setting should raise the possibility of hepatic necrosis as a diagnostic alternative to hepatic abscess.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

Depth correction is necessary when gastric emptying is studied by means of a labeled meal. In this study continuous anterior images were acquired from the onset of the food ingestion. Differences in depth were measured using a left lateral view. A minimal and crude depth correction was performed. The results obtained with this correction method were compared with those obtained using the depth correction technique of the mean. The results obtained in the anterior projection without any depth correction were also compared with those obtained using the method of the mean. The results obtained with both correction techniques were identical in 18 gastric emptying studies. This approach also permits the creation of a time-activity curve over the duodenum in the anterior projection. In this way the lag phase can easily be assessed.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

The Xe-133 ventilation pattern in congestive heart failure (CHF) was assessed using 24 inpatient ventilation/ perfusion studies performed to rule out pulmonary embolism. Patients with histories of CHF, myocardial infarction (Ml), and cardiomyopathy were included in the study. Frank pulmonary edema, pulmonary embolism, and other known lung diseases such as chronic obstructive lung disease, tumor, and pneumonia were excluded. Fifteen of the 24 patients had abnormal ventilation scans. Twelve of the 15 showed bilateral basal Xe-133 retention on washout; the remaining 3 showed diffuse, posterior regional retention. On perfusion scans, 14 of the 15 abnormal ventilation patients showed evidence of CHF such as inverted perfusion gradient, enlarged cardiac silhouette, or patchy perfusion, and all of them had a history of CHF or cardiac disease. Nine of the 24 patients had normal ventilation scans, including normal washout patterns. Seven of the nine had normal perfusion (p<0.01). Four of the nine normal ventilation patients had a history of cardiac disease or CHF but no recent acute Ml. Bilateral basal regional Xe-133 retention, coupled with perfusion scan evidence of CHF such as inverted perfusion gradient, enlarged cardiac silhouette, and patchy perfusion pattern, appears to be a sensitive and characteristic ventilation/perfusion finding in mild or subclinical CHF.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

Tc-99m MDP bone scintigraphy is widely used for initial staging and subsequent follow-up of patients with osteosarcoma. Two unusual cases are presented here, one with diffuse pleural metastases and one with diffuse peritoneal metastases. In one case, an abnormal bone scan was the first indication of metastatic disease. Both the metastatic pattern of osteosarcoma and the indications for bone scintigraphy are reviewed.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

Several unusual complications of I-131 therapy for thyroid carcinoma are known. Two patients who developed a further unusual event that consisted of a palpable mass and cystic degeneration are described.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

To improve the scintigraphic differential diagnosis of thyroid nodules, Tc-99m pertechnetate-TI-201 Cl subtraction scintigraphy (Tc-TI subtraction scanning) was performed in 106 patients with various histologically proven thyroid nodules. Results were evaluated by comparison with surgical findings and preoperative ultrasonographic results. Thyroid nodules were more successfully detected by Tc-TI subtraction scanning than by either Tc-99m pertechnetate or TI-201 Cl scintigraphy alone. Detection of nodules was further improved when images recorded by the three methods were integrally observed (sensitivity 83%, accuracy 89%), with detectability approaching that of ultrasonography. False-positive or -negative Tc-TI subtraction scans were obtained principally when multiple nodules were present (7 cases) or when no discrepancy existed between the accumulations of Tc-99m pertechnetate and TI-201 Cl (18 cases). Most colloid nodules exhibited irregular margins, heterogeneous internal accumulations of TI-201 Cl, and distorted shapes on Tc-TI subtraction scans, while the majority of adenoma were oval-shaped with smooth margins. Carcinoma were characterized by homogeneous internal accumulation of TI-201 Cl and distorted shapes.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

Scintigraphy with I-131 metaiodobenzylguanidine (MIBG) was effective in depicting a pancreatic insulinoma in a patient suffering from intermittent hypoglycemia. This observation widens the range of neuroendocrine tumors that take up to I-131 MIBG and supports the concept that many tumors of the amine precursor uptake and decarboxylatlon system may be imaged in this way.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

F-18 fluorodeoxyglucose (FDG) accumulates into regions of enhanced glucose uptake and metabolism such as the brain, heart, and malignant tumors. The clinical usefulness of this positron-emitting radiopharmaceutical is illustrated in a case where the clinical picture and CT indicated a malignant bone lesion in the clavicle. Histologically a stress fracture was found secondary to chronic strain on the clavicle. On follow-up the lesion's course was benign. Planar imaging with F-18 FDG was performed twice during follow-up, and on both occasions there was no accumulation of radioactivity over the suspicious area, indicating normal glucose consumption. This case demonstrates the differential diagnostic potential of F-18 FDG and shows that clinically useful information may be obtained without a position emission tomograph.

ISSN:0363-9762    

出版商:OVID    

年代:1989

数据来源: OVID