contemplation objectives: To assess the part of contrast-enhanced dynamic CT in the diagnosis of active tuberculoma.

Setting: Hospitals with an isolated ward for tuberculosis.

Methods: Fifty-five controls with newly diagnosed active tuberculoma and 24 make subordinates with inactive tuberculoma were examined and evaluated retrospectively. Six make submissives with active tuberculomas and seven bring under rules with inactive tuberculomas were confirmed on histologic and microbiologic evaluation of resect specimens, whereas the remainder of the make subordinates with tuberculoma were confirmed clinically. The controls were receiving iopamidol, 370 mg/mL IV, at a rate of 30 mL/ forward contrast-enhanced dynamic CT. The time-attenuation turn was obtained and adapted to a [gamma] function. The peak height (PH) maximum attenuation subtracted according to the background attenuation, relative come (RF), and mean regional result were used for comparison.

Measurements and results: In the surgically confirmed dispose the PH and RF values of six make submissives with active tuberculomas were significantly higher than those of the seven exposes with inactive tuberculoma (p < 005) Similarly, in the enthralls with noninvasive diagnoses, the PH and RF values of 49 make submissives with active tuberculoma were significantly higher than those of the controls with inactive tuberculoma (mean [+ or -] SD PH 434 [+ or -] 41 Hounsfield units [HU] v 116 [+ or -] 27 HU p < 00001; RF 0012 [+ or -] 0001/ v 0006 [+ or -] 0001/ p < 005) When the cutoff value was defined as mean [+ or -] 2 SD the sensitivity and specificity of the diagnosis for active tuberculoma were 771% and 964% in PH and 685% and 888% in RF respectively.

Conclusion: Contrast-enhanced dynamic CT is a potentially valuable tool for the diagnosis of active tuberculoma.

first note of the scale words: dynamic CT; mycobacterium tuberculosis; tuberculoma

Abbreviations: HU = Hounsfield units; PCR = polymerase chain reaction; PR = peak height; RF = relative flow; ROI = region of interest

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A tuberculoma typically appears as a fairly discrete nodule or mass in which repeated extensions of infection have created a core of caseous necrosis encompassed by a mantle of epithelioid solitary abode; squalids and collagen with peripheral spherical cell infiltration. (1) Most tuberculomas are < 3 cm in diameter, although lesions up to 5 cm have been reported. (2) Patients with these tuberculomas are generally asymptomatic, and the lesions are excised because of the radiographic suspicion of malignancy. The mien of benign-looking calcification within the nodule, adjacent tree-in-bud lesions, or satellite nodules may help in discriminating tuberculomas from other conditions. However, tuberculomas without these findings are frequently experienced. (3-7)

Contrast-enhanced dynamic CT analyses of pulmonary tumors have been performed mainly to discriminate malignant nodules from benign singles (8-10) Although the peak height (PH) value of time-attenuation inflects has been shown to cast reproach tumoral vascularity and to be correlated with the number of intratumoral microvessels in lung cancer, active inflammatory nodules including tuberculomas many times show higher PH values than malignant tumors. (10-13) Inflammatory processe other than tuberculoma many times show enhancement on dynamic CT scans. (12) However, tuberculomas are considered to be different from other inflammatory diseases, because active tuberculomas have the potential to shed bacilli into the sputum and the patient must be kept in isolation if in as it is a condition. Furthermore, active tuberculomas must be differentiated from neoplastic nodules. It is thus real important to discriminate active and inactive tuberculomas. In the current study, we attempted to elucidate the character of contrast-enhanced dynamic CT in the differential diagnosis of active and inactive tuberculomas.

MATERIALS AND METHODS

Subjects

A total of 79 consecutive make subordinates with tuberculoma (49 men and 30 women; age range, 25 to 88 years; mean age, 628 years) were chronicleed and evaluated retrospectively in the at hand study (Table 1). This post was set in hospitals with an isolation ward for tuberculosis. Institutional review board approval and informed acquiescence were obtained. The diagnosis was based forward the diagnostic standards and classification of tuberculosis in adults and children published by way of the American Thoracic Society. (14) We evaluated tuberculoma to be active when the diagnosis was confirmed forward the basis of positive agriculture results for Mycobacterium tuberculosis in the sputum BAL fluid, and/or on the polymerase chain reaction (PCR) rule We diagnosed inactive tuberculoma when there was a history of a previous episode of tuberculosis and/or when the nodule forward conventional CT scans was clinically stable from one side of to the other an interval of at least 3 month associated with a positive reaction to tuberculin skin experiment negative bacteriologic study findings, and no evidence of other granulomatous nodules. We exclud enthralls from this study if they definitely had calcification in nodules forward conventional CT scans. Thirteen subdues in whom lung cancer could not be rul on the outside clinically underwent video-assisted thoracoscopic surgery and were eventually and pathologically evaluated as having tuberculosis. The disease activity was, then determined by the agency of the pathologic inflammatory findings and also by the agency of the existence of M tuberculosis microscopically or at the PCR method.

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