摘要:

PurposeTo determine whether rapid, dynamic SPECT imaging with Tc-99m labeled red blood cells was technically feasible and of value in the detection of cavernous hemangiomas of the liver.Materials and MethodsThe acquisition protocol for Tc-99m labeled red blood cell imaging of hepatic hemangiomas was modified with six sequential 3-minute SPECT images replacing the planar flow phase. Delayed 20-minute SPECT of the liver was then performed 2 hours later.ResultsThe authors present examples of pathologically proven positive and negative cases and retrospectively review their patient series. Examination of 19 patients with 41 lesions revealed no evidence of a false-positive examination results and only one false-negative result. Only one lesion seen to be positive with a 2-hour delayed study was not seen within 18 minutes. Lesions as small as 1.0 cm could be detected with a 3-minute SPECT.ConclusionsRapid, dynamic early SPECT hemangioma imaging is feasible, provides images with relatively good quality, and can replace the planar flow phase.

ISSN:0363-9762    

出版商:OVID    

年代:1997

数据来源: OVID

摘要:

The authors evaluated the suitability of Tc-99m MIBI to be used as an alternative to Ga-67 in pulmonary sarcoidosis imaging. Studies were performed on 21 patients. Eleven patients (group I) had been on corticosteroid treatment before the study, while 10 patients (group II) had received no treatment. Activity of sarcoidosis was assessed from clinical manifestations of the disease, pulmonary function tests, bronchoalveolar lavage, high-resolution computed tomography, and serum biochemistry. Ga-67 imaging results were abnormal in 73% of patients of group I (n = 8) and 90% of patients of group II (n = 9). Tc-99m MIBI imaging results were abnormal in 0% of patients of group I (n = 0) and 40% of patients of group II (n = 4). The lymph nodes were better demonstrated with Ga-67. Abnormal results of Ga-67 imaging were 100% sensitive to clinically active sarcoidosis, but had a relatively low specificity (33%). In contrast, abnormal MIBI imaging had very low sensitivity (11%). The authors conclude that planar Tc-99m MIBI scintigraphic images are not sensitive for the diagnosis of pulmonary sarcoidosis.

ISSN:0363-9762    

出版商:OVID    

年代:1997

数据来源: OVID

摘要:

The authors present a case of bone infarction in the proximal epiphysis of the right tibia, which was caused by preoperative intraarterial chemotherapy for osteosarcoma. MR imaging revealed that suspected metastases had inhomogeneous signal intensity similar to that of the primary tumor, which made a metastatic lesion difficult to exclude. On Tl-201 SPECT, no accumulation was found in the lesions, confirming that they were not osseous metastases. Consequently, this enabled limb salvage surgery to be performed with joint preservation. Intraoperative biopsy revealed no viable tumor cells in the lesion, and bone infarction was suspected. Tl-201 SPECT was very useful, not only in differentiating bone infarction from tumor progression, including metastatic lesions, but also in the determination of the operative technique.

ISSN:0363-9762    

出版商:OVID    

年代:1997

数据来源: OVID

摘要:

A 28-year-old man had recurrent episodes of headache, ophthalmoplegia, and ptosis. MR imaging showed a mass within the sphenoid sinus. Tl-201 imaging showed intense uptake in the region of the sphenoid sinus and right middle fossa with moderate retention of activity, suggesting the diagnosis of a viable tumor. A biopsy specimen from the sphenoid sinus revealed dense inflammatory infiltrate dominated by plasma cells, consistent with inflammatory pseudotumor. After radiation therapy, the mass showed no significant change on MR imaging, but regressed in size and uptake on the follow-up Tl-201 scan. Tl-201 may accumulate in nonmalignant inflammatory lesions and could mimic a viable tumor. It is, therefore, suggested that before surgery and histologic diagnosis, any abnormal intracranial accumulation of Tl-201 should be interpreted with caution.

ISSN:0363-9762    

出版商:OVID    

年代:1997

数据来源: OVID

摘要:

Spontaneous gallbladder perforation is a very rare condition in infants. Most gallbladder perforations occur in adults, frequently due to trauma. Ultrasound, peritoneal lavage, and retrograde cholangiography may give indirect evidence of the possibility of this condition. There is no definitive diagnostic modality that can definitely determine the diagnosis in such cases. A case of gallbladder perforation with localized biliary ascites detected on radionuclide hepatobiliary imaging is presented.

ISSN:0363-9762    

出版商:OVID    

年代:1997

数据来源: OVID

摘要:

Two patients with hypochromic microcystic anemia received intravenous iron therapy (Blutal, Yuham Co., An Yang, Korea). These patients demonstrated diffuse hepatic uptake of Tc-99m MDP on bone scintigraphy, which was performed for evaluation of lower back pain in one patient and to rule out skeletal metastases from gastric cancer in the other patient. Blutal is an iron colloid chondroitin sulfate complex and is used to treat iron deficiency anemia in Korea. Phagocytized iron colloid within the hepatic reticuloendothelial system is responsible for the hepatic uptake of Tc-99m phosphate in the two presented cases.

ISSN:0363-9762    

出版商:OVID    

年代:1997

数据来源: OVID

摘要:

A 45-year-old man with chronic lymphocytic leukemia and a retroperitoneal mass underwent Tc-99m labeled red blood cell bleeding imaging to localize a bleeding source. The bleeding scan showed a linear accumulation of radiotracer obliquely oriented along the left upper epigastrium to the right midepigastrium. This area of uptake increased in intensity and assumed a more globular appearance throughout the study, but did not change in location. This is the pattern of a retroperitoneal bleed resulting from active hemorrhage into the retroperitoneal mass.

ISSN:0363-9762    

出版商:OVID    

年代:1997

数据来源: OVID

摘要:

In-111 DTPA cisternography confirmed placement and patency of a slow flow, implanted, programmable, intrathecal morphine infusion pump system. Other radiologic methods failed and were impractical.

ISSN:0363-9762    

出版商:OVID    

年代:1997

数据来源: OVID

摘要:

PurposeMultifocal eosinophilic granuloma (Hand-Schüller-Christian syndrome) consists of localized lesions of histocytosis X originating from proliferating Langerhans' cells involving male children and young adults.MaterialsThe authors present the first case of multifocal eosinophilic granuloma that was imaged by Tc-99m monoclonal antibody BW250/183 recognizing NCA-95 antigen on granulocytes. A 30-year-old man had a diagnosis of histiocytosis X for 16 years.ResultsAll active known lesions were visualized. The previous radiotherapy fields were also accurately demonstrated as areas with no antibody accumulation. Bone marrow biopsy taken 30 hours after injection showed no infiltrations, but mild hypoplasia suggesting chronic disease was demonstrated. Retrospectively, the authors performed digital autoradiography from tissue samples and found specific targeting with the same BW250/183 antibody.ConclusionTheir results indicate that antibody targeting is possible in multifocal eosinophilic granuloma, probably even allowing radioimmunotherapy.

ISSN:0363-9762    

出版商:OVID    

年代:1997

数据来源: OVID

摘要:

A rare case of an unsuspected postoperative left ventricular pseudoaneurysm first detected during a radionuclide ventriculogram is reported.

ISSN:0363-9762    

出版商:OVID    

年代:1997

数据来源: OVID