MRI features in foetal microtia

Abstract Background: Atresia of the external auditory canal is positively correlated with the difficulty and success rate of operation after birth. At present, ultrasound screening often obtains images of body position, placenta and amniotic fluid, and the detection rate is low. Moreover, it is unable to evaluate whether the external auditory canal shows atresia. Methods: We retrospectively conducted MRI features of 9 cases those were diagnosed foetal microtia from May. 2019 to Oct. 2020. Results: Nine cases of microtia foetus were analysed: male, five cases; female, four cases; right ear, five cases; left ear, four cases; and degree I, one case (bilateral external auditory canal is shown); degree II, eight cases (affected external auditory canal is not shown, six cases of normal external auditory canal shown, two cases of normal external auditory canal not shown). All parturients underwent amniocentesis full exon gene detection, of which the results were negative. The magnetic resonance imaging (MRI) features of microtia, included abnormal external ear morphology, disappearance of normal structure, mass-like and small piece-like soft tissue shadow and equal signal on T2-weighted (T2W) imaging. The upper and lower diameters were significantly smaller than that of the normal side. The MRI features of external auditory canal atresia included disappearance of T2W linear high signal shadow in the temporal bone scale. Conclusions: Foetal MRI can diagnose microtia and evaluate atresia of the external auditory canal.

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Atypical magnetic resonance imaging features and differential diagnosis of hepatocellular carcinoma

Journal of International Medical Research ◽

10.1177/0300060520943415 ◽

2020 ◽

Vol 48 (10) ◽

pp. 030006052094341

Author(s):

Shuang-Yu Wang ◽

Lei Yin ◽

Chen Wang ◽

Ming-Ping Ma

Keyword(s):

Magnetic Resonance Imaging ◽

Hepatocellular Carcinoma ◽

Magnetic Resonance ◽

Diagnostic Accuracy ◽

Central Star ◽

High Signal ◽

Imaging Features ◽

Resonance Imaging ◽

Mri Features ◽

Magnetic Resonance Imaging Mri

Objective Hepatocellular carcinoma (HCC) is the most common primary malignant tumor of the liver. We aimed to summarize and analyze the atypical magnetic resonance imaging (MRI) features of HCC to improve its diagnostic accuracy. Methods We retrospectively analyzed MRI data for 66 patients with HCC with atypical MRI features confirmed by operation and pathology. Results Twelve patients had high signals and 18 patients had significant decreases in opposed phase signals in T1WI plain scans. Nine patients had high signals and six patients had large cystic lesions in apparent diffusion coefficient images. Dynamic enhancement showed progressive enhancement in 15 patients, ring enhancement in three, irregular patchy enhancement in three, ‘nodule-in-nodule’ enhancement in six, delayed central patchy enhancement in six, delayed central ‘star-like aristate scars’ (T2WI revealed high signal intensity) in 21, and poor blood supply in three patients. Conclusions MRI can make a clear diagnosis of typical HCC, and atypical cases can also be distinguished from other tumors or tumor-like lesions by MRI. The analysis of atypical signs may improve the diagnostic accuracy of MRI for HCC.

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Transplantation of autologous oral mucosal epithelial cell sheets inhibits the development of acquired external auditory canal atresia in a rabbit model

Acta Biomaterialia ◽

10.1016/j.actbio.2020.04.031 ◽

2020 ◽

Vol 110 ◽

pp. 141-152

Author(s):

Taro Inagaki ◽

Tsunetaro Morino ◽

Ryo Takagi ◽

Masayuki Yamato ◽

Izumi Koizuka ◽

...

Keyword(s):

Epithelial Cell ◽

External Auditory Canal ◽

Rabbit Model ◽

Cell Sheets ◽

Mucosal Epithelial Cell ◽

Canal Atresia

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Head and neck osteosarcoma: CT and MR imaging features

Dentomaxillofacial Radiology ◽

10.1259/dmfr.20190202 ◽

2020 ◽

Vol 49 (2) ◽

pp. 20190202

Author(s):

Zhendong Luo ◽

Weiguo Chen ◽

Xinping Shen ◽

Genggeng Qin ◽

Jianxiang Yuan ◽

...

Keyword(s):

Soft Tissue ◽

Head And Neck ◽

Giant Cell ◽

High Signal ◽

Imaging Features ◽

Matrix Mineralization ◽

Imaging Characteristics ◽

Mri Features ◽

Signal Intensities ◽

Ct And Mri

Objective: This study aims to assess the CT and MRI features of head and neck osteosarcoma (HNO). Methods: 37 HNOs were identiﬁed, and the following imaging characteristics were reviewed on CT and MRI. Results: A total of 37 patients(age 41.5 ± 15.0 years old; 16 males, 21 females) were included in the study. Tumours occurred in the maxilla (16, 43.2%), mandible (8, 21.6%), skull base (6, 16.2%), calvarium (5, 13.5%), paranasal sinuses (1, 2.7%) and cervical soft tissue (1, 2.7%). 16 patients received radiotherapy for nasopharyngeal carcinoma. Three patients (8.1%) developed osteosarcomas related to a primary bone disease. 16 of the (43.2%) tumours demonstrated lytic density on CT scans, followed by 13 (35.1%) showing mixed density and 7 (18.9%) with sclerotic density. Matrix mineralization was present in 32 (86.5%). 3 out of 24 (12.5%) tumours showed lamellar periosteal reactions, 21 out of 24 (87.5%) showed spiculated periosteal reactions. 12 tumours showed low signal intensities on T1WI, with 16 having heterogeneous signal intensities. 10 tumours showed high signal intensities on T2WI, and 18 showed heterogeneous signal intensities. With contrast-enhanced images, 3 tumours showed homogeneous enhancement (2 osteoblastic and 1 giant cell-rich), 18 tumours showed heterogeneous enhancement (13 osteoblastic, 4 fibroblastic and 1 giant cell-rich), and 7 tumours showed peripheral enhancement (6 chondroblastic and 1 osteoblastic). These tumours were characterized by soft tissue masses with a diameter of 5.6 ± 1.8 cm. Conclusions: HNO is a rare condition and is commonly associated with previous radiation exposure. This study provides age, sex distribution, location, CT and MRI features of HNO.

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MRI features of responsible contacts in vascular compressive trigeminal neuralgia and prediction modeling

Acta Radiologica ◽

10.1177/0284185120983971 ◽

2021 ◽

pp. 028418512098397

Author(s):

Yufei Zhao ◽

Jianhua Chen ◽

Rifeng Jiang ◽

Xue Xu ◽

Lin Lin ◽

...

Keyword(s):

Trigeminal Neuralgia ◽

Predictive Model ◽

Trigeminal Nerve ◽

Roc Curve ◽

Neurovascular Compression ◽

Diagnostic Efficiency ◽

Mri Features ◽

Vascular Origin ◽

Magnetic Resonance Imaging Mri ◽

Mri Characteristics

Background Multiple neurovascular contacts in patients with vascular compressive trigeminal neuralgia often challenge the diagnosis of responsible contacts. Purpose To analyze the magnetic resonance imaging (MRI) features of responsible contacts and establish a predictive model to accurately pinpoint the responsible contacts. Material and Methods Sixty-seven patients with unilateral trigeminal neuralgia were enrolled. A total of 153 definite contacts (45 responsible, 108 non-responsible) were analyzed for their MRI characteristics, including neurovascular compression (NVC) grading, distance from pons to contact (Dpons-contact), vascular origin of compressing vessels, diameter of vessel (Dvessel) and trigeminal nerve (Dtrigeminal nerve) at contact. The MRI characteristics of the responsible and non-responsible contacts were compared, and their diagnostic efficiencies were further evaluated using a receiver operating characteristic (ROC) curve. The significant MRI features were incorporated into the logistics regression analysis to build a predictive model for responsible contacts. Results Compared with non-responsible contacts, NVC grading and arterial compression ratio (84.44%) were significantly higher, Dpons-contact was significantly lower at responsible contacts ( P < 0.001, 0.002, and 0.033, respectively). NVC grading had a highest diagnostic area under the ROC curve (AUC) of 0.742, with a sensitivity of 64.44% and specificity of 75.00%. The logistic regression model showed a higher diagnostic efficiency, with an AUC of 0.808, sensitivity of 88.89%, and specificity of 62.04%. Conclusion Contact degree and position are important MRI features in identifying the responsible contacts of the trigeminal neuralgia. The logistic predictive model based on Dpons-contact, NVC grading, and vascular origin can qualitatively improve the prediction of responsible contacts for radiologists.

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Magnetic resonance imaging of spinal arteriovenous malformations

Journal of Neurosurgery ◽

10.3171/jns.1987.66.6.0830 ◽

1987 ◽

Vol 66 (6) ◽

pp. 830-834 ◽

Cited By ~ 75

Author(s):

John L. Doppman ◽

Giovanni Di Chiro ◽

Andrew J. Dwyer ◽

Joseph L. Frank ◽

Edward H. Oldfield

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Arteriovenous Malformations ◽

High Signal ◽

Resonance Imaging ◽

Content Type ◽

Spinal Arteriovenous Malformations ◽

Magnetic Resonance Imaging Mri ◽

Spinal Avm ◽

Fine Print

✓ Magnetic resonance imaging (MRI) was performed on 12 patients with spinal arteriovenous malformations (AVM's). Six lesions were intramedullary, five were dural, and one was in a posterior extramedullary location. Serpentine filling defects similar to the classic myelographic findings were demonstrated within the high-signal cerebrospinal fluid on T2-weighted coronal scans. The intramedullary nidus was identified by MRI as an area of low-signal intensity within the cord in all six intramedullary AVM's. Neither the dural nor the posterior extramedullary lesions showed intramedullary components. It is concluded that MRI may noninvasively provide the initial diagnosis of a spinal AVM and distinguish intramedullary from dural and extramedullary lesions.

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Methomyl poisoning presenting with decorticate posture and cortical blindness

Neurology International ◽

10.4081/ni.2014.5307 ◽

2014 ◽

Vol 6 (1) ◽

Cited By ~ 1

Author(s):

Chih-Ming Lin

Keyword(s):

Brain Mri ◽

Vital Signs ◽

Altered Mental Status ◽

Cortical Blindness ◽

High Signal ◽

Blurred Vision ◽

Cerebral Disease ◽

Cerebral Magnetic Resonance Imaging ◽

Neurological Effects ◽

Magnetic Resonance Imaging Mri

Methomyl is a potent pesticide that is widely used in the field of agriculture. The systemic toxic effects of methomyl have been well described. However, the neurological effects of methomyl intoxication are not well understood. In this study, we report a 61-year-old Taiwanese man sent to our emergency department because of altered mental status. His family stated that he had consumed liquid methomyl in a suicide attempt. He was provided cardiopulmonary resuscitation because of unstable vital signs. He was then sent to an intensive care unit for close observation. On the second day of admission, he regained consciousness but exhibited irregular limb and torso posture. On the sixth day, he started to complain of blurred vision. An ophthalmologist was consulted but no obvious abnormalities could be identified. On suspicion of cerebral disease, a neurologist was consulted. Further examination revealed cortical blindness and decorticate posture. Cerebral magnetic resonance imaging (MRI) was arranged, which identified bilateral occipital regions lesions. The patient was administered normal saline and treated with aspirin and piracetam for 3 weeks in hospital. During the treatment period, his symptom of cortical blindness resolved, whereas his decorticate posture was refractory. Follow-up brain MRI results supported our clinical observations by indicating the disappearance of the bilateral occipital lesions and symmetrical putaminal high signal abnormalities. In this article, we briefly discuss the possible mechanisms underlying the cerebral effects of methomyl poisoning. Our study can provide clinicians with information on the manifestations of methomyl intoxication and an appropriate treatment direction.

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External Auditory Canal Atresia with Otitis Media in a Dog

Journal of Veterinary Clinics ◽

10.17555/jvc.2021.38.3.159 ◽

2021 ◽

Vol 38 (3) ◽

pp. 159-162

Author(s):

Ah Reum Kim ◽

Dongbin Lee ◽

Jae-Hoon Lee ◽

Hee Chun Lee ◽

Changhee Han ◽

...

Keyword(s):

Otitis Media ◽

External Auditory Canal ◽

Canal Atresia

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MRI features of different types of sinonasan rhabdomyosarcomas: a series of eleven cases

Dentomaxillofacial Radiology ◽

10.1259/dmfr.20210030 ◽

2021 ◽

pp. 20210030

Author(s):

Junjie Zeng ◽

Lan Liu ◽

Jiayong Li ◽

Qiling Huang ◽

Leiming Pi ◽

...

Keyword(s):

Bone Destruction ◽

Imaging Features ◽

Resonance Imaging ◽

Bone Invasion ◽

Mri Features ◽

Different Types ◽

Magnetic Resonance Imaging Mri ◽

Haematogenous Metastasis ◽

Ethmoid Sinuses ◽

Pathological Subtypes

Objective: To retrospectively analyze magnetic resonance imaging (MRI) features of various pathological subtypes of sinonasal rhabdomyosarcoma (RMS) and explore correlations between imaging features and pathological subtypes. Methods: In total, 11 cases with embryonal, alveolar or pleomorphic sinonasal RMSs, confirmed by surgical pathology, were selected. Their characteristics and distinctive imaging features were analysed, and the correlation between pathology and imaging features was explored. Results: Bone destruction was observed in all 11 cases with RMS. Expansive growth was predominant in three alveolar and three embryonal RMS cases, and creeping growth was predominant in two alveolar, two embryonal and one pleomorphic RMS cases. Signs of residual mucosa were observed in all 11 cases, and 10 cases showed involvement of multiple sinus cavities and orbital cavities. All cases exhibited mild-to-intermediate enhancement. Conclusion: Sinonasal RMSs have the following characteristic MRI features: ethmoid sinuses and middle nasal conchae are the prevalent sites; lesions are mainly of mild enhancement; tumours exhibit signs of residual mucosa, mild-to-intermediate enhancement and frequent orbital involvement; bone invasion and bone destruction are frequently observed; and haematogenous metastasis is not as common as lymphatic metastasis. RMSs of various pathological subtypes were not significantly distinct by imaging.

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