MRI Diagnosis of Neighboring Meningeal Enhanced in Atgpical Brain Abscess
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Objective Retrospectively analyze the MRI appearance of atypical brain abscess and investigate diagnosis value of neighboring meningeal enhanced of MRI in atypical brain abscess. Materials and Methods The MRI findings of 16 cases with atypical brain abscess proved by operation and pathology .All patients were performed by plain and contrast MRI scanning.Plain CT scan was obtained in 5 cases before operation. Results 12 of 16 brain abscess lesions showed single cavity, 4 cases showes multiple cavity .The diameter of abscess cavity was more than 3cm in 13 cases. On the wall of the brain abscess in 12 cases of routine MRI ,there was a dark belt with isointensity signal. Other 4 cases, the wall of the brain abscess is blur and incontinous . All of 16 cases were rings enhanced, 7 cases showed the wall of abscess were uneven thickness, 5 cases presents irregular forms , 4 cases showed enhanced nodules on the wall of abscess.The abnormal enhancing meningeal neighboring the abcess were showed in all patients. Conclusion To master the MRI appearance of atypical brain abscess,especially the enhancing meningeal neighboring the lesion,is helpful for diagnosis.Keywords:
Brain abscess
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OBJECTIVE To study the MRI features of abscess and cystic tumor during the cerebellar envelope period so as to improve the accuracy of MRI in diagnosis of abscess during the cerebellar envelope period.METHODS The imaging and clinical data of 48 patients with cerebellar cystic swelling lesions,which included 11 cases with cerebellum package tacit abscess,were retrospectively analyzed.Before the treatment,all the 48 patients with cerebellar cystic lesions underwent the conventional MRI scan and enhanced DWI examination.A comparative study of the enrolled cases was performed according to eight MRI features including the large cyst and small nodules levy,T2 low signal ring sign,ring enhancement levy(with or without mural nodules),diffuse high signal levy,small focal edema levy,vascular flow void sign,pseudopodia sign,and multi-room levy.RESULTS T2 low signal ring levy emerged in 100.0% of the abscess cases during the cerebellar envelope period,and did no occur in any case with the cystic tumors;The positive rates of the ring enhancement levy in the cases with cerebellum capsule abscess and the cases with other cystic tumors were 100.0% and 78.3%,respectively,but the abscess cases were with thin wall and were without mural nodule shape.The cystic tumors cases were with uneven wall thickness of ring enhancement levy,in which 64.8% were complicated with mural nodules.CONCLUSION The MRI characteristic performance has great value in the differential diagnosis of the cerebellar capsule period abscess and cystic tumor.
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Objective To investigate the value of MRI in the diagnosis of intracranial ring enhancing lesions. Methods MRI findings of 66 cases of intracranial ring enhancing lesions were retrospectively analyzed. Results Among the 66 patients,48 had tumors,10 had brain abscess, 6 had chronic haematoma and 2 had cerebral cysticercosis. Among the 48 cases of tumors,benign tumors were located in the saddle area and cerebellopontine angle in 10(8 cases of acoustic neuroma and 2 cases of trigeminal neurinoma),malignant gliomas were located in supratentorial,temporal,parietal,and occipital cortex in 25,and metastatic tumors were located in corticomedullary junction in 13.Among the 10 cases of brain abscess,bacterial brain abscess was found in 9 and tuberculous brain abscess in 1. Conclusion Intracranial ring enhancing lesions on MRI images have different characteristics and manifestations, which can provide an important basis for the diagnosis of intracranial ring enhancing lesions and help to develop the effective treatment programs.
Brain abscess
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Brain abscess
T2 weighted
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Objective To evaluate the value of “low signal zone” sign in the diagnosis of brain abscess in the capsule period.Methods The conventional MRI was performed pre therapy in 21 patients with brain abscess in the capsule period and 25 patients with vesica astrocytomas. We analyzed the pathologic basis of “low signal zone” sign in brain abscess and compared the frequency and shape of “low signal zone” sign in brain abscess and vesica astrocytomas. Results The “low signal zone” sign in MRI occurred more frequently in brain abscess (85.7%,18/21) than in vesica astrocytomas (52.0%,13/25). The “low signal zone” sign in the former was intact, while that in the latter was not.Conclusion The “low signal zone” sign is helpful to diagnose brain abscess in the capsule period, and is valuable to differentiate brain abscess and vesica astrocytomas.
Brain abscess
Capsule
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Objective To investigate the imaging characteristics of intracranial non tumor space occupying lesion. Methods The imaging data of 49 patients, including 20 cases of brain abscess, 19 cases of brain tuberculosis (or meningeal tuberculosis), and 10 cases of brain parasitic infestation, confirmed clinically, were analyzed retrospectively. Results The CT findings of most cases of brain abscess were in circular shape with the same density as or slightly lower density than that of the normal brain tissue on plain CT scan and with obvious annular enhancement on enhanced CT scan. For tuberculosis induced granuloma, the membrane of the local lesion was unclear on plain scan and most lesions showed small ring signs on the contrast enhanced image. Irregularly low density area was found in 5 cases with pulmonary fluke infection. Multiple lesions and some macular calcification and low density area were found in 2 cases with brain cysticercosis. On the contrast enhanced CT scan, the lesion showed signet ring signs. Conclusion General image analysis is quite important in the diagnosis of intracranial non tumor space occupying lesion. In addition, the combination of the clinical data with those of epidemiology, immunological test of cerebrospinal fluid, and other laboratory examination is necessary.
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Objective To explore brain abscess in CT scanning technique and diagnostic value. Methods On the operation of puncture and41 pathologically confirmed cases of brain abscess in patients with CT plain scan and enhanced, the CT findings were retrospectively analyzed. Results Of the 41 cases, 12 cases of multiple cerebral abscesses, solitary brain abscess in 29 cases. Solitary brain abscess9 cases which occurred in the parietal lobe, temporal lobe in 7 cases, 5 cases of frontal and parietal lobe, occipital lobe in 5 cases, bilateral ventricles and ventricular anterior horn in 1 cases, 1 cases of 1 cases of cerebellum, thalamus. Ping sweep for the area of low density, low density ring whose inner is visible, enhanced visible morphology is not consistent with ring enhancement. Conclusions Abscess of brain CT image has the character of, the scanning techniques and methods of diagnosis, clinical treatment options and prognosis significance.
Brain abscess
Parietal lobe
Occipital lobe
Lateral ventricles
Frontal lobe
Lobe
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Objective:To discuss the application value of MRI to the brain abscess diagnosis.Methods: 35 cases with the brain abscess,which were verified through clinical,surgical,or pathological diagnosis,were examined through conventional plain scanning,enhancement,FLAIR and DWI,respectively.Results: 45 lesions were found on the 35 cases with brain abscess.Among the 45 lesions,15 displayed the dark line sign on T1W1,19 the shade sign on T2WI,15 the bright band sign on FLAIR;19 lesions displayed hyperintense signal to variable degrees on DWI with low value of ADC,and six hypointense or isointense signal on DWI with high value of ADC;45 lesions had obvious enhancement in the abscess wall and showed a abscess cavity,abscess wall,and edema zone.Conclusions:The dark line sign and ADC value are valuable for MRI diagnosis of brain abscess.DWI should be incorporated into routine examination.
Fluid-attenuated inversion recovery
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Objective To discuss MRI features of the brain abscess. Methods MRI features of 46 cases with brain abscess, which were proved by biopsy and surgery,were analyzed retrospectively,and a comparision with pathologic findings was made. Results Songle lesion was observed in 36 (78.2%) cases,roughly round shape in 36cases(78.2)%. Evident circular enhancement in imaging enhanced procedure,regular inner margin in 84.6%,regular outer margin in 73.1%,uniformity thickness of circular enhancement in 80.7%. Central fluid-fluid plane sign was observed in 30 cases; Mural nodular was observed in 3 sases;Vice ring sign was observed in23 brain abscesses; No multi locular sign was observed; low signal circular sign on T2-weignted imaging was observed in 34 cases;Ⅱ degree edema was observed in 28 cases. Infective symptom and sign of clinical manifestions were observed in 20 cases. Conclusion Circular enhancement,low signal circular sign on T2-weighted imaging,central fluid-fluid sign, vice ring sign are particular sign of brain abscess. Regular outer and inner margin,uniformity thickness,no mural nodular and pitting on the wall, and infective symptom and sign are very helpful for differential diagnosis.
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Objective:To study the value of low field MRI in the diagnosis of bacterial abscess of liver. Methods:Of 19 patients,23 bacterial abscesses of liver which were proved by pathology or clinical follow-up,the MRI findings before and after Gd-DTPA enhancement were retrospectively analyzed.Results:The location of the 23 lesions were in right lobe (n=14) and left lobe (n=9).Typical MR manifestations were seen in 7 lesions,presenting as ring sign,double-target sign,central liquified necrosis,air bubble or air-fluid level within the lesion and peri-lesional oedema.16 lesions had atypical features,which varied according to different stages of the abscess,displayed as cluster sign,honeycomb sign,spider-feet sign etc.Conclusion:Various characteristic findings in different stages of bacterial abscess could be assessed by low field MRI,and the diagnostic accuracy could be improved.
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Objective To study the value of MRI in the diagnosis ofcircle-surrounded brain abscess. Methods 19 cases of circle-surroundedbrain abscess,confirmed with surgery or therapy against inflammation,were studied.The patients were aged from 6 to 60 years.Routineand contrast-enhanced MRI was employed to examine the patients.Results On the wall of the brain abscess in all the cases,there wasa smooth“dark belt”with low signal.Contrast-enhanced scanningrevealed that the wall of the abscess was thickened with circularintensification.The inner edge was smooth.The MRI features ofbrain abscess were quite specific especially the presence of the“dark belt”. Conclusion MRI plays an important role in thediagnosis of brain abscess.
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