[The findings of fluorodeoxyglucose F18 imaging of coincidence single photon emission computed tomography in the lung tuberculoma].

OBJECTIVE: To assess the uptake of Fluorodeoxyglucose F18 ((18)F-FDG) coincidence single photon emission computed tomography (SPECT) imaging in lung tuberculoma. METHODS: We enrolled 27 cases with 29 tuberculomas confirmed by clinical diagnosis. (18)F-FDG triple-head coincidence imaging was performed. The intensity of uptake was graded by visual method and the relationship of the uptake and attenuation was analyzed. RESULTS: The uptake of (18)F-FDG was graded by visual method. There were 10 lesions (34.5%) in grade 0, including 7 (24.1%) lesions that showed focal lack of uptake and 3(10.3%) lesions showed normal uptake in tomograph imaging. Eleven lesions (37.9%) were graded as 1 - 2, 5 lesions (17.2%) as 3, and 3 lesions as 4. With grade 0 - 2 being regarded as benign, the false positive rate was 8/29. The intensity of (18)F-FDG uptake was divided into 3 groups (grade 0, grade 1 - 2, grade 3 - 4) and the intensity of uptake was compared with the attenuation of tuberculomas. There was a statistically significant difference among the 3 groups (χ(2) = 13.29 - 18.02, P < 0.01). CONCLUSIONS: The intensity of (18)F-FDG uptake was influenced by the attenuation of the lesion. Most lung tuberculomas for (18)F-FDG coincidence imaging were of low uptake, and lower uptake than the background was a characteristic finding for tuberculoma. The combination with CT imaging was useful for the differentiation from malignant lesions.

[CT image features of 46 cases with pneumonic-type lung cancers].

OBJECTIVE: To analyze the CT image features of pneumonic-type lung cancer and to reduce misdiagnosis. METHODS: The CT findings of 46 patients with pneumonic-type lung cancer were retrospectively reviewed, and CT image in the differential diagnosis of this special kind of disease was evaluated. RESULTS: According to the extent of lesion, these cases were divided into two groups: multi-lobe consolidation group and single lobe consolidation group. The lesions in the latter group located in the upper, middle or lower lobe, respectively. Twenty-nine cases had homogeneous consolidation lesion, 14 cases showed single or multiple cysts and cavities in the lesions, 3 cases exhibited localized low density in the lesion. Forty-one cases shown the sign of air bronchogram with presentation of narrow air bronchogram in 25 of those. Forty cases showed well or ill defined ground-glass opacitiy surrounding the consolidation lesion. Fifteen cases had multi-nodules or opacities distributed in centrilobular or centric bronchiolar location. Of the 30 patients who received contrast medium, 23 showed distinct enhancement, and 7 showed indistinct enhancement with a positive CT angiogram. CONCLUSION: CT findings including lower lobe distribution, homogeneous consolidation, narrow air bronchogram, well defined ground-glass and CT angiogram are helpful in differentiating pneumonic-type lung cancer from various kinds of infection. However, most of CT manifestations of pneumonic-type lung cancer are not specific. Therefore, it's necessary to combine CT findings with other clinical data when making diagnosis.

[Diagnosis of pulmonary sclerosing hemangioma with incremental dynamic CT: analysis of 20 cases].

OBJECTIVE: To evaluate the value of incremental dynamic CT in the diagnosis of pulmonary sclerosing hemangioma (sclerotic hemangioma). METHODS: Thin-section CT at 2.0 mm thickness and 2.0 mm interval was performed before and after administration of contrast material in 20 cases of pulmonary sclerosing hemangioma. RESULTS: Pulmonary sclerosing hemangiomas were shown to be round or oval masses, with smooth margins, homogeneous parenchymal density, and occasional calcification. Homogeneous enhancement was evident in all cases, with maximum CT values ranging from 90 to 110 HU. CONCLUSION: Spiral dynamic CT is useful in the diagnosing of sclerosing hemangioma in the lungs.