[en] A 42-year-old man was admitted with hematochezia. Approximately one hour prior to admission, this industrial worker was attempting to disengage a jammed staple gun when a staple dislodged accidently . Approximately one-half hour later, he noted bright red blood per rectum. Shortly after admittance an emergency gastrointestinal bleeding scintigraphy study was performed. Ten mCi of in vitro labeled Tc-99m RBCs were injected. Sequential 500 K images were obtained over the abdomen every 5 minutes for 40 minutes. Three representative images are shown, demonstrating active gastrointestinal bleeding. The patient was taken to the operating room were a distal jejunal bleed was seen. Enterostomy was performed and the vessel was ligated. This interesting case demonstrates the pathophysiology of an unusual cause of gastrointestinal bleeding

[en] An Indium-111 labeled white blood cell scan suggested the presence of a pelvic abscess in a woman at four weeks postpartum. This was not identified on a subsequent gallium scan. This discrepancy can be attributed to the normal accumulation of white blood cells within the uterus at one month postpartum

[en] A whole body bone scan obtained on a 21-year-old woman with sickle cell disease and chronic renal failure showed localization of the radionuclide diffusely in the stomach. The localization of the radionuclide represented metastatic calcification of the stomach caused by secondary hyperparathyroidism

[en] A case of Noonan's syndrome with pulmonary lymphangiectasia detected with lymphoscintigraphy is reported

[en] One of the explanations of a cold lesion on static bone imaging is the presence of an aggressive, destructive lesion. This is the first reported case of such a lesion with an aggressive nature that was confirmed by abnormal flow and pool images

[en] The diagnosis of a cholecystocolic fistula has often presented a dilemma to the practicing physician. Routine imaging modalities to confirm this diagnosis have not proven extremely successful. The presence of a small fistulous tract from the gallbladder to the colon is often difficult to demonstrate radiographically. However, with the advent of the newer hepatobiliary radioisotopic scanning agents, the ability to visualize the intrahepatic and extrahepatic bile ducts as well as the presence of the intestinal activity of the radiotracers has improved considerably. The authors present a case of cholecystocolic fistula that was adequately demonstrated with a Tc-99m-PIPIDA hepatobiliary scan. This article is the first to report demonstration of this type of fistula with hepatobiliary scanning

[en] Eight patients with proven or suspected neoplastic lesions were examined with 1-aminocyclobutane C-11-carboxylic acid and 1-aminocyclopentane C-11-carboxylic acid using positron emission computed tomography. The results of this comparative study have shown that both of these unnatural amino acids have a high affinity for malignant tumors. The potential of nonmetabolizable C-11-labeled amino acids as noninvasive indicators of metabolic tumor activity is demonstrated and discussed

[en] Two radiocolloid preparations, differing in particle size by a factor of 5 to 20, were compared in each of 15 patients. The smaller colloid, measuring less than 80 nm, showed a relative decrease in the calculated target to background ratios for the liver and spleen and an increase for the bone marrow. The increased uptake of the smaller particle in the bone marrow, as measured by the bone marrow to soft-tissue background ratio, was about 50% higher than that of the larger colloidal particles. Comparable marrow images can be obtained in a half to a third of the time with the smaller particle size for a given administered dose

[en] Good correlation of glomerular filtration rate (GFR) measured isotopically from plasma disappearance of Tc-99m-DTPA (Sn) was shown with inulin clearance, creatinine clearance, and graded radionuclide imaging. The isotopic GFR is a simple, urineless technique not requiring continuous infusion that enables one to perform simultaneous renal imaging with one radiotracer

[en] Thyroid carcinoma scans in the immediate post-therapy period after therapeutic doses of I-131 for well-differentiated thyroid carcinoma showed additional lesions in ten of 24 (42%) patients or on 13 of 42 (31%) occasions, whereas the corresponding pretreatment diagnostic scans done with a small test dose failed to reveal the lesions. In four patients, lesions were only discernible on the regional rectilinear scan views and not on the total-body images. The value of post-therapy scans and the importance of obtaining the regional views are emphasized