Computed tomographic and angiographic findings in renal oncocytoma

Abstract

Nine cases with histologically proven renal oncocytoma are presented. In all cases, ultrasonography gave the first indication of a tumour and intravenous urography was tumour-specific in only six, whilst angiography was so in only four of the cases with peripheral extension beyond the normal organ limits. Examination by computed tomography showed retrospectively, in the three cases with smaller oncocytomas up to 3 cm in diameter, findings that seemed promisingly characteristic: without contrast medium, the tumour appeared homogeneously hyperdense in comparison with normal renal parenchyma, but homogeneously hypodense after injection of contrast medium. One of the smaller oncocytomas, however, showed regions of heterogeneity both with and without contrast medium. Only one oncocytoma of 4 cm diameter presented the central stellate, low-attenuation "scar" described by Quinn et al. The angiographic criteria cited by Ambos were fulfilled in only three of the larger oncocytomas. In four of the cases, the tumour was enucleated and the organ left in situ on the basis of frozen section diagnosis. Those patients with tumours extending outside the organ or those of questionable diagnosis on frozen section were treated by nephrectomy. In one patient, the pathologist suspected metastasis from the thyroid; hemithyroidectomy confirmed on oncocytic adenoma of the left thyroid lobe.

Renal Oncocytoma of the Native Kidney after Renal Transplantation

“…At computed tomography, a renal oncocytoma presents as a mass with precontrast attenuation similar to normal parenchyma. The tumor shows a homogeneous contrast enhancement and appears as a solid, well-marginated homogeneous mass [12][13][14]. Computed tomography, however, is not a reliable method for differentiating between oncocytomas and renal cell carcinomas [15].…”

Radiologic Findings in Renal Oncocytoma

“…The series consists of 32 patients (17 men, 15 Urography was performed using conventional technique with radiographs obtained immediately after i.v. injection of 60 m1 of 60 or 76% sodium meg1umine amidotrizoate, 5, 10, and 15 min after injection.…”

Mycobacterium celatum as a cause of disseminated infection in an AIDS patient

“…Analysis of 16s rRNA showed some nucleotide differences from the two genotypes previously described, and a new group of M . ceelatum type 3 was proposed [7]. Zurawski et al have reported two cases of pneumonia and bacteremia in AIDS patients in the USA but information about genotypes was not available [8].…”

“…M . celatum type 2 is the only genotype that has not shown cross reactivity with the commercial DNA probes for MTB identification [7,10]. Another point of interest is the positive result with P C R for MTB.…”

“…To our knowledge, there is only one previous report in which the Amplicor MTB P C R Detection Kit was used. The 14 type 3 strains gave negative results [7]. Definitive identification must be performed on the basis of chromatographic mycolic patterns and molecular genetic analysis.…”