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A Lightweight Convolutional Neural Network with Hierarchical Multi-Scale Feature Fusion for Image Classification

Journal of Computer and Communications 2024年第2期12卷 173-200页

作者： adama dembele Ronald Waweru Mwangi Ananda Omutokoh Kube Department of Mathematics Pan African University Institute for Basic Sciences Technology and Innovation Nairobi Kenya Department of Computing School of Computing and Information Technology Jomo Kenyatta University of Agriculture and Technology Nairobi Kenya Department of Mathematics and Actuarial Sciences Kenyatta University Nairobi Kenya

Convolutional neural networks (CNNs) are widely used in image classification tasks, but their increasing model size and computation make them challenging to implement on embedded systems with constrained hardware resources. To address this issue, the MobileNetV1 network was developed, which employs depthwise convolution to reduce network complexity. MobileNetV1 employs a stride of 2 in several convolutional layers to decrease the spatial resolution of feature maps, thereby lowering computational costs. However, this stride setting can lead to a loss of spatial information, particularly affecting the detection and representation of smaller objects or finer details in images. To maintain the trade-off between complexity and model performance, a lightweight convolutional neural network with hierarchical multi-scale feature fusion based on the MobileNetV1 network is proposed. The network consists of two main subnetworks. The first subnetwork uses a depthwise dilated separable convolution (DDSC) layer to learn imaging features with fewer parameters, which results in a lightweight and computationally inexpensive network. Furthermore, depthwise dilated convolution in DDSC layer effectively expands the field of view of filters, allowing them to incorporate a larger context. The second subnetwork is a hierarchical multi-scale feature fusion (HMFF) module that uses parallel multi-resolution branches architecture to process the input feature map in order to extract the multi-scale feature information of the input image. Experimental results on the CIFAR-10, Malaria, and KvasirV1 datasets demonstrate that the proposed method is efficient, reducing the network parameters and computational cost by 65.02% and 39.78%, respectively, while maintaining the network performance compared to the MobileNetV1 baseline.

关键词： MobileNet Image Classification Lightweight Convolutional Neural Network Depthwise Dilated Separable Convolution Hierarchical Multi-Scale Feature Fusion

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Meningeal Hemangiopericytoma: A Rare Intracranial Tumor—About a Case

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Case Reports in Clinical Medicine 2022年第9期11卷 386-392页

作者： Aboubacar Sidiki Keita Mamadou Diallo adama dembele Mamadou Cisse Medical Imaging Department H&ocirc pital Nord Franche Comté Trevenans France Faculty of Health Sciences and Techniques of Gamal Abdel Nasser University Conakry Guinea Medical Imaging Department Centre Hospitalier Intercommunal Elbeuf Louviers Rouen France Medical Imaging Department Centre Hospitalier de Blois Tours France

Introduction: Hemangiopericytoma is a very rare vascular tumor, difficult to diagnose, often confused with a meningioma. Imaging is not very specific and the diagnostic certainty remains histological. Observation: We report a case of meningeal hemangiopericytoma in a 48-year-old patient with a history of active smoking and whose sister died of glioblastoma. He was brought to the emergency room for a fall, confusion, and tonic-clonic seizures. The diagnosis was suspected on imaging (CT and MRI, in front of a syndrome of right temporal intraventricular mass measured at 37 mm in diameter, centered on the choroid plexus, with perilesional vasogenic edema and posterior white commissure. There was homogeneous enhancement of the lesion after gadolinium injection. The diagnosis was confirmed by immunohistochemical study, which showed diffuse expression of STAT6 and partial labeling for CD34, without significant expression of SSTR2. Expression of neurofilament protein was also found in the brain parenchyma. Conclusion: Hemangiopericytoma is a rare tumor, characterized by its malignant potential, its high rate of recurrence and distant metastasis. The management is based on a total microsurgical resection followed by radiotherapy.

关键词： Intracranial Meningeal Hemangiopericytoma Surgery Metastasis Radiotherapy

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Contribution of Cardiac MRI in the Diagnosis of Acute Myocarditis

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Open Journal of Radiology 2023年第1期13卷 17-25页

作者： Aboubacar Sidiki Keita Mamoudou Camara Mamadou Diallo adama dembele Mamadou Cisse Medical Imaging Department North Franche-Comte Hospital Trevenans France Faculty of Health Sciences and Techniques Gamal Abdel Nasser University of Conakry Conakry Guinea Medical Imaging Department Elbeuf Louviers Intercommunal Hospital Center Elbeuf France Medical Imaging Department Blois Hospital Center Blois France

Objective: To describe the MRI abnormalities observed in acute myocarditis. Materials and Methods: Retrospective cross-sectional study with a descriptive aim, carried out at the North Franche-Comte Hospital, over a period of 12 months, from January 2021 to December 2021. It covered all patients who received an MRI of heart disease and were diagnosed with myocarditis. The diagnosis of myocarditis was retained in all patients on the basis of two arguments: a T2 PSIR hyper signal and a late enhancement at 15 min in T1 PSIR with gadolinium. Results: Myocarditis was diagnosed in 20 patients out of a total of 214 who performed cardiac MRI, i.e. 10.30% of cases. The average age was 33.7 ± 14.3 with extremes of 17 and 69 years. We observed a male predominance with 11 men (55%) for 9 women (45%) or a sex ratio of 1.2. Clinical suspicion of myocarditis and acute coronary syndrome were the main indications for MRI. The lesion sites were subepicardial (95%) and/or intramural (30%), respecting the subendocardium, interesting for the majority, segments 12 (anterolateral) in 50% and/or 11 (inferolateral) in 43% of cases. Global hypokinesia was observed in 30% of patients associated with a decrease in LVEF. There was no cardiac volume abnormality or valvular abnormality. Conclusion: Cardiac MRI is nowadays the most efficient non-invasive imaging in the diagnosis of acute myocarditis. The diagnosis of myocarditis was made on 2 pathognomonic signs, namely a T2 STIR hyper signal and late enhancement at 15 min in T1 PSIR after injection of gadolinium. The morphology and lesion locations were in agreement with those described in previous studies. Global hypokinesia and pericardial effusion were observed in some patients. On the other hand, there was neither valvular anomaly, nor cardiac volume anomaly.

关键词： Cardiac MRI Acute Myocarditis Acute Coronary Syndrome

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Ectopic Pregnancy: Epidemiological, Clinical, Therapeutical, Anatomopathological Aspects and Prognosis at the Department of Obstetrics and Gynecology of the Teaching Hospital Souro Sanou of Bobo-Dioulasso: About 79 Cases and Literature Review

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Open Journal of Obstetrics and Gynecology 2022年第1期12卷 1-10页

作者： Bambara Moussa Togbe Alihonou Eric Serge Lankoande David dembele adama Ouedraogo Issa Head Department of Obstetrics and Gynaecology Teaching Hospital Sour&ocirc Sanou of Bobo-Dioulasso Bobo-Dioulasso Burkina Faso Gynaecologist Obstetrician UHO Ouayigouya Burkina Faso

Objective: To study the epidemiological, clinical, therapeutical, anatomopathological aspects and prognosis of the ectopic pregnancy. Methodology: It was a transversal and descriptive study from January 1st to December 31st 2018 at the department of obstetrics and gynecology of the Teaching Hospital Sourô Sanou of Bobo-Dioulasso. Results: During the study period, we registered 4706 deliveries with 1272 cases of cesareans and 79 cases of ectopic pregnancy with a frequency of 1 ectopic pregnancy for 60 deliveries and 6 ectopic pregnancies for 100 caesareans. The average age of the patients in our study was 28.66 years old (19 - 45 years) and the average parity of 1.96 [0 - 6]. Married women represented 83.54 % of the workforce. The risk factors were dominated by sexual transmitted diseases (25.31%) and abortions (20.25%). Clinical signs were dominated by pelvic pain (100% of cases), metrorrhagea (86.5% of cases) and amenorrhea (64.6% of cases). Culdocentesis brought lysed incoagulable blood in 83.7% cases. The immunological pregna

关键词： Ectopic Pregnancy Surgical Emergency Salpingectomy Prognosis

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Contribution of Imaging in the Diagnosis and Management of Type 1 Autoimmune Pancreatitis Associated with Main Bile Duct Cholangitis: A Case Report

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Case Reports in Clinical Medicine 2022年第5期11卷 175-181页

作者： Keita Aboubacar Sidiki Camara Mamoudou Diallo Mamadou dembele adama Bah Ousmane Aminata Cisse Mamadou Medical Imaging Department H&ocirc pital Nord Franche Comté Trévenans France Faculty of Health Sciences and Techniques the Gamal Abdel Nasser University of Conakry Conakry Guinea Medical Imaging Department Centre Hospitalier Intercommunal Elbeuf Louviers Elbeuf France Medical Imaging Department Centre Hospitalier de Blois Blois France

Introduction: Autoimmune pancreatitis type 1 (AIP) is a rare condition characterized by inflammatory and fibrosing involvement of the pancreas, associated with elevated serum IgG4 and potential involvement of other organs. It often mimics a malignant tumor with which the differential diagnosis is often difficult. Observation: We report a case of AIP type 1, in a 70-year-old patient, with a heavy history of arterial hypertension, insulin-induced type II diabetes, overweight, gastric ulcer, ischemic heart disease with triple bypass, COPD, revealed by intense abdominal pain and acute evolution. The diagnosis was evoked on imaging, in front of an aspect of “sausage pancreas”, with delayed contrast enhancement of the pancreas, loss of lobulations, and the presence of a fibrous peripancreatic shell. The biological and histological assessment confirmed the diagnosis and avoided inappropriate surgical treatment. Conclusion: AIP type 1 is a rare pathology whose diagnosis is difficult. Only a perfectly interpreted imagery can evoke it. The biological assessment, in particular, the elevation of the serum level of IgG4 and the histology make it possible to confirm the diagnosis. The challenge in its management is to avoid unnecessary surgery and/or inappropriate treatments. Imaging, in this context, plays a preponderant role, in particular, thanks to the dynamic injection sequences of gadolinium chelates on MRI which suggest the fibro-inflammatory nature of pancreatic lesions.

关键词： Autoimmune Pancreatitis CT MRI

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Staphylococcus xylosus Isolation of Conjunctival Secretions in an 8-Year-Old Child at Sikasso Hospital (Mali): About a Case

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Open Journal of Medical Microbiology 2022年第2期12卷 49-55页

作者： Moro Sidibe Abdoulaye Napo adama dembele Oumar Kassogué Oumar Diallo Djonny Jonas dembele Mamadou adama Togo Kadiatou Ba Koita Abdoulaye Nouhoum Coulibaly Abdoulaye Konaté Jeannette Traore Fatoumata N’Diaye Japhet Popanou Thera Lamine Traore Sikasso Regional Hospital Sikasso Mali Alliance for the Development of Community Ophthalmology (ADCO) Bamako Mali Institute of Tropical Ophthalmology of Africa Bamako Mali Sikasso Medical Biology Laboratory (BIOSIK) Sikasso Mali

Staphylococcus xylosus is a species of bacteria belonging to the genus Staphylococcus. This genus currently includes several species and subspecies. We distinguish between 2 groups: the group of coagulase-positive staphylococci (CoPS) and coagulase-negative staphylococci (CoNS), a larger group that includes more than forty species and subspecies. Among the CoNS, Staphylococcus xylosus occupies a special place because it is frequently isolated from meats, dairy products, and agricultural environments. It is commonly used in fermentation due to its primary role in the flavor and color development of fermented products. It is a commensal bacterium of the skin of small mammals and farm animals, where it constitutes the majority of flora. In this species, there are a large number of strains, including phenotypes and genotypes. Although S. xylosus is actually a recognized non-pathogenic species, a few strains can be potentially dangerous. They can thus be responsible for mastitis and dermatitis in cattle. With the multiplicity of breeding farms, the consumption of livestock products and the increasingly frequent contact of humans with animals a few rare cases of human opportunistic infections have also been reported in the literature. These include pyelonephritis, endocarditis, urinary, lymphatic, and lymph node infections, contamination of orthopedic materials and catheters. Thereby, we report the case of a lingering and chronic infection of the lacrimal tract by Staphylococcus xylosus in an 8-year-old child in the Ophthalmology Department of Sikasso hospital in Mali.

关键词： Staphylococcus xylosus Infection Sikasso Hospital Mali

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Socio-Economic Impacts of Primary Open-Angle Glaucoma in Rural Environment in Mali

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Open Journal of Ophthalmology 2022年第4期12卷 430-437页

作者： Moro Sidibe Abdoulaye Napo adama dembele Daouda Goita Oumar Diallo Djonny Jonas dembele Mamadou adama Togo Kadiatou Ba Koita Abdoulaye Nouhoum Coulibaly Cheick Fantamady Tounkara Nouhoum Toure Abdoulaye Konaté Jeannette Traore Fatoumata N’diaye Lamine Traore Japhet Popanou Thera Regional Hospital of Sikasso Sikasso Mali Alliance for the Development of Community Ophthalmology (ADOC) Bamako Mali African Tropical Ophthalmology Institute Bamako Mali

Primary open-angle glaucoma (POAG) is an optic neuropathy that affects the patient’s quality of life. The present study aims to write the socio-economic factors influencing the management of glaucomatous patients in rural areas. This was a retrospective, descriptive cross-sectional study, carried out from October 19 to 31, 2017 in a rural town. The variables studied were age, sex, occupation, level of knowledge about the disease and its treatment, average monthly income, accessibility of eye care service, health insurance membership, degree of severity of the disease. The frequency of POAG was 5.68%. The average age of the patients was 52 years old with extremes ranging from 25 to 73 years old;the female sex was the most represented with 19 cases out of 36 or 52.77%. 66.67% of our patients were at their first ophthalmological consultations. Health insurance coverage was 2.78%. The average monthly income was 10,000 to 25,000 FCFA in 58.33%. More than half of our glaucomatous patients, 63.89%, think they are affected by their disease. 80% of patients are unaware that they have eye disease. Many lost vision in one or both eyes and were unaware of the disease affecting their eyes. Accessibility to health services and their costs seem to be a factor, in addition to illiteracy.

关键词： Glaucoma Postman Rural Environment Socio-Economic

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Bilateral Central Serous Chorioretinopathy (CRSC) in Pregnancy Complicated with Retroplacental Hematoma: About a Case

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Open Journal of Ophthalmology 2023年第1期13卷 13-22页

作者： Daouda Goita Moro Sidibe Mala Sylla Nana Wangara Mamadou Kolé Sidibe adama dembele Gounon Saye Abdoulaye Napo Nouhoum Guirou adama Guindo Mamadou adama Togo Abdoulaye Nouhoum Coulibaly Oumar Diallo Japhet Popanou Thera Lamine Traore BOUGOUNI Reference Health Center Bougouni Mali Sikasso Regional Hospital Mali/Alliance for the Development of Community Ophthalmology (ADOC) Bamako Mali Institute of Tropical Ophthalmology of Africa Bamako Mali/Alliance for the Development of Community Ophthalmology (ADOC) Bamako Mali Alliance for the Development of Community Ophthalmology (ADOC) Bamako Mali National Eye Health Program Bamako Mali

Introduction: Central serous chorioretinopathy (CSCR) is associated with serous sensorineural retinal detachment in the macular region. The condition that affects the male gender more than their female counterpart results from focal leakage disturbance of retinal pigment epithelial cells and choroidal abnormalities. The corticosteroid is highlighted as one of the major factors that promote the occurrence of CSCR. Stress and pregnancy, especially in the third trimester, have also been reported by some authors. Central serous chorioretinopathy associated with pregnancy complicated by retroplacental hematoma is a rare event. Observation: We report the case of a pregnant woman at approximately 34 weeks of amenorrhea who presented a sudden and severe drop in visual acuity on a pregnancy complicated by retroplacental hematoma and delivered by cesarean section. The diagnosis was based on clinical arguments associated with photos of the retina made by the MII Ret Cam device (Made In India, Retinoscope Camera) highlighting the lifting of the macular region. Ophthalmological monitoring without medical or physical treatment was instituted. At two months of progression without treatment, bilateral visual acuity was 10/10. Conclusion: Central serous chorioretinopathy and pregnancy is not unusual;however, its bilateral and brutal form in a context of pregnancy complicated by retroplacental hematoma is rare. Despite this favorable evolution, monitoring remains necessary in order to prevent recurrences and complications.

关键词： MII Ret Cam Central Serous Chorioretinitis Retroplacental Hematoma

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Basedowian Orbitopathy Without Thyreotoxicosis : A Case Report from Sikasso Hospital

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Open Journal of Ophthalmology 2023年第3期13卷 273-279页

作者： Cheickna Nomoko adama dembele Moro Sidibe Karim Diarra Moussa Sidibé Niamé Touré Moussa Abdou Touré Oulematou Soucko Ousmane Fané Daouda Goita Oumar Diallo Djonny Jonas dembele Mamadou adama Togo Kadiatou Ba Koita Abdoulaye Nouhoum Coulibaly Cheick Fantamady Tounkara Nouhoum Touré Abdoulaye Konaté Abdoulaye Napo Nana Kadidia Fofana Regional Hospital of Sikasso Sikasso Mali Alliance for the Development of Community Ophthalmology (ADOC) Bamako Mali Referral Health Center for Commune 3 in the District of Bamako Bamako Mali African Tropical Ophthalmology Institute Bamako Mali Referral Health Center for Commune 4 in the District of Bamako Bamako Mali

Basedowian orbitopathy is an autoimmune disease representing the most frequent extra-thyroidal manifestation. Its pathophysiology is imperfectly elucidated and is the result of cross-reactivity between thyroid antigens and orbital tissue. It is most frequently seen in the context of hyperthyroidism (basedow’s disease or Graves’ disease), sometimes hypothyroidism (Hashimoto’s thyroiditis), or euthyroidism. Diagnosis is often straightforward, but management remains difficult. The introduction of simple medical treatment exposes the patient to the risk of recurrence. In Sikasso, there have been few studies of Graves’ disease. The aim of this study was to describe the clinical, therapeutic and evolutionary features of Graves’ disease in Sikasso Hospital. The patient was a 35-year-old woman with no previous history of Graves’ disease and no history of alcohol or tobacco intoxication, consulting for bilateral exophthalmos with moderate pain for 1 year. Endocrine tests were normal (euthyroidism), as was orbital-cerebral MRI, which revealed stage II exophthalmos with no sellar or supra-saltar abnormalities. The main complication was exposure to keratitis. Our patient was treated with corticosteroids. The evolution was favorable under treatment, with no recurrence after one year’s follow-up. Graves’ disease is the most common cause of hyperthyroidism, but this should not obscure the diagnosis of euthyroidism, as demonstrated in this case report. Exophthalmos remains the main ophthalmological clinical manifestation.

关键词： Euthyroidism Basedowian Orbitopathy Orbital-Cerebral MRI Corticoster-oid Therapy

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Meningioma of the Optical Nerves in a Case at the Hospitalier Center of Saint Denis in Ile de France

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Open Journal of Ophthalmology 2023年第1期13卷 23-29页

作者： adama dembele Moro Sidibe Ibrahim Conaré Mamadou Kolé Sidibé Larcheveque Florence Seror Julien Abdoulaye Napo Daouda Goita Oumar Diallo Djonny Jonas dembele Mamadou adama Togo Kadiatou Ba Koita Abdoulaye Nouhoum Coulibaly Cheick Fantamady Tounkara Nouhoum Touré Abdoulaye Konaté Jeannette Traore Sanoussi Bamani Lamine Traoré Japhet Popanou Théra Regional Hospital of Sikasso Sikasso Mali Alliance for the Development of Community Ophthalmology (ADOC) Bamako Mali African Tropical Ophthalmology Institute Bamako Mali Hospital Center Saint Denis France

Summary: Optic nerve tumors are rare tumors, representing 3% - 5% of intracranial tumors developing mainly along the optic nerve and/or the chiasm. Optic nerve meningiomas are histologically benign tumors whose severity is linked to diagnostic and especially therapeutic difficulties. The Optic nerve meningioma is the second leading cause of optic nerve tumor after glioma. Observation: We report the case of a 49-year-old woman from South Asia, who consults an ophthalmology department for progressive visual loss in her right eye for about a year with her glasses and would like to renew her optical correction. Having no particular medical history apart from left unilateral blindness is known for approximately 15 years. Magnetic Resonance Imaging (IRM) cerebral found a tissue mass with a clear outline and polylobules on the left temporo-peduncular. Through this case, we describe the circumstances of discovery of the disease, the clinical characteristics, as well as our diagnostic approach. Conclusion: In the majority of cases, these are benign tumours, the circumstances of which are discovered in multiple ways. A mostly unilateral and non-improvable loss of visual acuity must attract our attention. Renewing glasses may be the reason for discovering the disease. Today Magnetic Resonance Imaging (IRM) remains an important and capital examination for the diagnosis and monitoring of this pathology.

关键词： Meningioma Optic Nerve Decreased Visual Acuity IRM

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