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Objective:To explore the evolution of imaging findings on dynamic chest high resolution CT（HRCT） in patients with mild COVID-19.Methods:The data of epidemiology, clinical data and continuous dynamic chest high-resolution CT images of the patients with mild COVID-19 were analyzed retrospectively. Twenty-five patients (including 24 common type and 1 mild) were enrolled in the group, including 14 males and 11 females, with age of （42±12） years and hospital stay of （19±5） days. The basic images and dynamic images of HRCT were analyzed and compared by the radiologists.Results:The clinical manifestations were fever (22 cases), cough (18 cases), expectoration (8 cases), pharyngeal pain (6 cases). Most laboratory tests lacked specificity. There were no significant abnormalities on chest CT of one mild patient. HRCT findings of the common type were as follows: (1) the distribution of the lesions: most of the multiple lesions involved both lungs (19 cases), with average of 3 (3±1) lobes, located in the peripheral pulmonary zone near the pleura (22 cases); (2) the morphology and density of the lesions: most of the lesions were ground glass density foci (22 cases), which were patchy and massive (18 cases), nodular (10 cases) and arc broadband (7 cases); with the development of the disease, the density of some lesions increased with localized pulmonary consolidation (10 cases), accompanied by air bronchus sign (5 cases) and halo sign (5 cases). Dynamic changes of HRCT images in the chest: the positive manifestations were found on the 5th (5, 6) day after the onset of the disease, the progressive time of CT lesions was 5 (5, 7) days, the peak time of CT lesions was 11 (10, 13) days, and the turning time of CT lesions was 9 (8, 11) days.Conclusions:Dynamic chest HRCT can monitor the basic evolution process of the disease in patients with mild COVID-19, and provide a more intuitive basis for clinical early diagnosis and treatment.
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Objective To investigate the CT manifestations and differential diagnosis of benignity and malignancy of appendiceal mucocele.Methods The clinical and imaging data of 31 pathologically confirmed appendiceal mucocele were analyzed retrospectively,in which simple mucocele and mucinous cystadenoma were devided into benign group;low grade appendiceal mucinous neoplasm(LAMN) was devided into borderline group;mucinous cystadenocarcinoma was devided into malignant group.The CT manifestations were analyzed and compared statisticallyl in size(long diameter and short diameter), cyst wall(thickness, evenness, smoothness), intra-cystic contents(mural nodules, septum, calcification, intra-cystic fliud density), periappendiceal fat stranding, intraperitoneal free fluid and pseudomyxoma peritonei.Sensitivity and specificity values were calculated if single or multiple CT manifestations were used.Results Of the 31 cases of mucocele of the appendix, 11 of them were in benign group (including 8 cases of simple mucocele and 3 cases of mucinous cystadenoma);14 cases in borderline group (LAMN) and 6 cases in malignant group (mucinous cystadenocarcinoma).CT findings including evenness and smoothness of cyst wall, mural nodule, intraperitoneal free fluid and pseudomyxoma peritonei showed statistically significant difference among three groups (P0.05) in long diameter and short diameter of mucocele, attenuation of intraluminal contents, maximal wall thickness, calcifications, internal septa and periappendiceal fat stranding.
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The primary importance of magnetic resonance (MR) imaging in evaluating anal fistulas lies in its ability to demonstrate hidden areas of sepsis and secondary extensions in patients with fistula in ano. MR imaging is relatively expensive, so there are many healthcare systems worldwide where access to MR imaging remains restricted. Until recently, computed tomography (CT) has played a limited role in imaging fistula in ano, largely owing to its poor resolution of soft tissue. In this article, the different imaging features of the CT and MRI are compared to demonstrate the relative accuracy of CT fistulography for the preoperative assessment of fistula in ano. CT fistulography and MR imaging have their own advantages for preoperative evaluation of perianal fistula, and can be applied to complement one another when necessary.
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Adult , Female , Humans , Male , Middle Aged , Young Adult , Anal Canal/anatomy & histology , Magnetic Resonance Imaging , Rectal Fistula/diagnosis , Tomography, X-Ray ComputedABSTRACT
Objective To evaluate neurovascular anatomical relationship in patients with trigeminal neuralgia.Methods 49 patients with neuralgia were examined by MRI 3D-CISS in combination with 3D-TOF and MPR technique.The MRI findings were compared to the partial operative results.Results 13 patients who underwent surgery were considered as a responsible compression of vessel on 3D-CISS and 3D-TOF imaging,the compression caused by artery and vein was seen in operation in 10 cases and 3 cases respectively.18 (90%) of 20 patients with the symptom of maxillary division had neurovascular compression at the medial site of the root of trigeminal nervus,while 15(79%) of 19 patients with the symptom of mandibular division had compression at the lateral site.Conclusion 3D-CISS MR imaging is useful in the detection of neurovascular relationship and correlation between the region of neuralgic manifestation and the site of trigeminal nerve compression.