Atadan Tunacı

• Professor at Istanbul University

Purpose: This study aims to demonstrate the performance of machine learning algorithms to distinguish clinically significant prostate cancer (csPCa) from clinically insignificant prostate cancer (ciPCa) in prostate bi-parametric magnetic resonance imaging (MRI) using radiomics features. Methods: MRI images of patients who were diagnosed with can...

Several data sets have been collected and various artificial intelligence models have been developed for COVID‐19 classification and detection from both chest radiography (CXR) and thorax computed tomography (CTX) images. However, the pitfalls and shortcomings of these systems significantly limit their clinical use. In this respect, improving the w...

Prostate cancer is one of the most common cancers in men. In addition to methods such as prostate-specific antigen test, digital rectal examination, and transrectal ultrasonography, magnetic resonance imaging has an important role for accurate and reproducible diagnosis. However, guidance in targeted biopsies and recent use in determining localizat...

Background: Thorax computed tomography (CT) imaging is widely used as a diagnostic method in the diagnosis of coronavirus disease 2019 (COVID-19)-related pneumonia. Radiological differential diagnosis and isolation of other viral agents causing pneumonia in patients have gained importance, particularly during the pandemic. Aims: We aimed to inve...

Background Thoracic CT imaging is widely used as a diagnostic method in the diagnosis of COVID-19 pneumonia. Radiological differential diagnosis and isolation of other viral agents causing pneumonia in patients gained importance, especially during the pandemic period. Aims We aimed to investigate whether there is a difference between the CT imagin...

BACKGROUND: Chest computed tomography (CT) was obtained from many patients with or without the Coronavirus disease 2019 (COVID-19) due to the pandemic. This study aimed to define incidental findings on CTs of the patients. MATERİALS AND METHODS: From March 2020 to October 2020, three-thousand ten adults (age ≥ 18 years) with no radiological evidenc...

Purpose We aimed to compare COVID-19 imaging findings of young adults (19–35 years of age) with those of children (0–18 years) and to correlate imaging findings of young adults with their laboratory tests. Materials and methods This retrospective study included Real Time-Polymerase Chain Reaction (RT-PCR) confirmed 130 young adults (mean age: 28.3...

Objective: Differential diagnosis of idiopathic pulmonary fibrosis (IPF) is important among fibrotic interstitial lung diseases (ILD). This study aimed to evaluate the rate of IPF in patients with fibrotic ILD and to determine the clinical-laboratory features of patients with and without IPF that would provide the differential diagnosis of IPF. M...

Objective: To investigate the role of chest computed tomography (CT) examinations acquired early after initial onset of symptoms in predicting disease course in coronavirus disease 2019. Methods: Two hundred sixty-two patients were categorized according to intensive care unit (ICU) admission, survival, length of hospital stay, and reverse transc...

After its discovery by WC. Roentgen by the end of 1895, X-Rays were immediately used for medical and surgical purposes to detect foreign objects within the human body due to injuries and/or gunshots, which inspired discussions over its functionality in military surgery. X-Rays were first used in the beginning of 1896 at the British River Wars in Ni...

Background: Lungs are particularly vulnerable to both acute infections, including TB, and chronic diseases such as chronic obstructive pulmonary disease, as well as to malignancies, all of which require particular attention during war times in which health conditions are far from optimal. Methods: This retrospective cross-sectional study include...

The objective of this study was to evaluate the accuracy of the magnetic induction technique with a nonlinear tunable oscillator (the Tissue Resonance Interaction Method [TRIMprob]) in the diagnosis of prostate cancer (CaP). Overall, 148 men were split into two groups (patients at risk of CaP [Group 1] and controls [Group 2]) and evaluated with the...

To assess the accuracy of magnetic resonance imaging with pelvic phased-array and endorectal coils prospectively, and evaluate if endorectal coil provides any additional information to high resolution pelvic MR imaging in rectal carcinoma staging. Preoperative MRI of 25 patients with rectal carcinoma was performed with pelvic phased-array coil alon...

In this study, the diagnostic efficiency of virtual bronchoscopy, which is a new and helpful method to conventional fiberoptic bronchoscopy, has been investigated for endobronchial lung tumors and its clinical applications are discussed. 36 patients with clinically suspected lung cancer (28 males, 8 females, mean age 61; range from 39 to 74) underw...

Objective: The purpose of this article is to review the CT and MRI findings of cardiac hydatid disease. Conclusions: CT and MRI are helpful for localizing and defining the morphologic features of hydatid cysts. Specific signs include calcification of the cyst wall, presence of daughter cysts, and membrane detachment. CT best shows wall calcifica...

The purpose of this study was to determine whether contrast enhancement features on 3D volumetric gradient-recalled echoMR images allow differentiation of benign from malignant solitary pulmonary nodules. Forty patients with solitary pulmonary nodules (range of greatest diameter, 7-40 mm) detected on CT underwent unenhanced MRI and contrast-enhance...

Although the MR imaging features of cardiac masses and their differential diagnosis are well defined in the literature, we present a report of two lately observed myxoma cases, which were not seen on non-contrasted sequences, but were well visualized after contrast administration. From this point of view, we think that it would be adequate to call...

Virtual cystoscopy is a promising new technique based on computer-simulated rendering of the inner surface of the urinary bladder using volumetric magnetic resonance (MR) imaging data, thus enabling maneuvers that normally are not possible with conventional cystoscopy. Due to several distinct advantages over conventional cystoscopy such as minimal...

Our objective was to reveal the frequency and MDCT appearances of sternal variations and anomalies in subjects without sternal deformities. One thousand consecutive patients who underwent thoracic MDCT examination were enrolled in the study. All MDCT data, including multiplanar and curved-planar reconstructed images, were evaluated for detection of...

Secondary cardiac involvement by malignant lymphoma is not uncommon. However, it is frequently undetected before death, because the clinical manifestations of cardiac lymphoma are usually nonspecific. We describe the multidetector computed tomography and magnetic resonance imaging findings of a secondary cardiac lymphoma case in a patient with B-ce...

Purpose: To compare the image quality on low-dose urinary tract multidetector CT examinations with 80 kVp and 120 kVp. Materials and Methods: Seventy-six patients with urinary tract symptoms were evaluated for urinary tract calculi by unenhanced multidetector CT. The examinations were performed with a four-row detector CT scanner. In all patients,...

Although there have been a few reports about the magnetic resonance (MR) imaging features of infective endocarditis (IE), delayed contrast enhancement attributable to fibrosis has not been previously described. The case of a 4-year-old girl who was diagnosed with IE based on positive blood culture results and echocardiographic findings is presented...

Arterial manifestations of Behcet's disease consist of aneurysm formation, stenosis and occlusion. Aneurysms in Behcet's disease most commonly involve the pulmonary arteries and have been shown to resolve with medical treatment. However, this regression pattern with medical therapy has not been reported for aortic aneurysms to date. We present a 43...

Extracranial metastases from meningioma are very rare and among those the lungs are the most common metastatic site. In the literature, pulmonary metastases of meningiomas have been emphasized on their rarity, non-specific imaging findings, and cytologic features. Some definitive MR imaging features of intracranial meningiomas have been described....

The present study evaluated the possible effects of exposure to polypropylene flock on respiratory health and serum cytokines in a cross-sectional study of workers from a plant in Turkey. A total of 50 polypropylene flocking workers were compared to a control group of 45 subjects. All subjects filled out a respiratory questionnaire and underwent a...

PURPOSE To evaluate the high resolution 3D contrast - enhanced virtual MR cystoscopy for the detection of urinary bladder tumors that are less than 5 mm in diameter. METHOD AND MATERIALS Twenty patients with multiple bladder tumors underwent gadolinium-enhanced MR cystoscopy with the use of 3D Flash technique (TR 3.72 ms, TE 1.44 ms, FA 250, matri...

Contrast-enhanced 3D MR voiding urethrography (CE 3D MRVU) was performed on 5 healthy volunteers and 18 patients with urethral disease. After intravenous injection of 0.3 ml/kg gadolinium, the images of the three consecutive acquisitions of the 3D MRVU technique were obtained during voiding. The raw data were reconstructed on all patients for visua...

A prospective sonographic study of the normal thymus was performed to determine the size changes with age and to compare the results according to some clinical conditions, such as sex, breast versus formula feeding, and term or preterm status. One hundred fifty-one healthy infants underwent thymic sonography. Maximal transverse and longitudinal dim...

In this article, the value of multiple detector-row computed tomography (MDCT) in renal applications is discussed, with emphasis on clinical uses. The superiority of application techniques of MDCT renders it one of the most distinguished modality in detection of congenital anomalies, tumors, transplants, trauma, and arterial diseases of the kidney.

To evaluate the diagnostic efficiency of multislice CT colonography in the detection of colorectal tumors by comparing it with conventional colonography in patients with high risk of colorectal cancer. Thirty-seven patients who had undergone conventional colonoscopy because of a suspicion of colorectal cancer were scanned with a four-detector multi...

Endometriosis, an important gynecological disorder of reproductive women, affects most commonly the ovaries and less frequently the gastrointestinal tract, chest, urinary tract, and soft tissues. Endometriosis classically appears on MRI as a mass with a large cystic component and variable signal intensities on T1- and T2-weighted images due to the...

Department of Chest Diseases, Istanbul Faculty of Medicine, Istanbul University. To determine the clinical and radiographic presentation of pulmonary tuberculosis in non-AIDS immunocompromised patients (ICP). A retrospective review of medical records of 143 patients (63 immunocompromised patients and 80 immunocompetent patients) with pulmonary tube...

The purpose of this study was to demonstrate the initial results of the dynamic contrast-enhanced MRA in under four seconds in the assessment of anomalous pulmonary circulation. We performed dynamic contrast enhanced MRA on ten patients with a temporal resolution of 2-3 sec for each phase. Five patients had pulmonary vascular anomaly and five patie...

Hepatic angiomyolipoma is a rare liver pathology. In this case report, we describe MRI features of a hepatic angiomyolipoma with a high fat content, which was indeterminate on CT. In phase and out of phase T1-weighted spoiled gradient echo technique, T2-weighted fat suppressed fast spin echo technique and dynamic enhanced T1-weighted in phase gradi...

Chronic abuse of toluene by inhalation causes variable white matter changes and thalamic hypointensity on T2-weighted MR images. The purpose of our study was to assess cranial MR findings in a large series of patients who chronically abuse toluene-containing solvents to investigate the factors causing the qualitative variability of white matter cha...

Our knowledge about pulmonary complications of Behçet's disease continues to evolve, but we need controlled trials for the management of the disease. The main goal should be to elucidate the pathogenesis and standardize the management according to the underlying pathologic process.

Assessment in postoperative complications of gastrointestinal cancers via imaging modalities is of significant importance as diagnosing the cancer. Complications can be considered as an indicator for the success of surgical procedure, and has a vital importance for the patient. In this article the implications of CT, MR, ultrasonography and PET in...

The purpose of this study was to describe the magnetic resonance imaging findings of granulomatous hepatitis on T1-weighted, T2-weighted and postgadolinium images. Eight patients with histopathological diagnosis of granulomatous hepatitis were evaluated in this study. MRI examinations included precontrast T1-weighted breath-hold spoiled gradient ec...

Introduction Fiberoptic bronchoscopy (FOB) is a safe and effective method in diagnosis and staging of lung cancer, but it is an invasive method. Therefore, some other alternative nonin-vasive methods are being searched. With recent improvements in scanner technology, com-puted tomography may be thought as an alternative method to FOB. The trachea,...

The purpose of this study was to describe the magnetic resonance imaging (MRI) appearance of hepatic alveolar echinococcosis (HAE) on T(1)-weighted, T(2)-weighted and postgadolinium images. A total of 13 lesions were demonstrated in 13 patients. All patients underwent MR examination at 1 T imager. MR examinations included precontrast T(1)-weighted...

Cerebral alveolar echinococcosis is rare. We report a case with multiple intracranial masses which show cauliflower-like contrast enhancement pattern on MRI. The lesions originated from hepatic involvement with invasion of the inferior vena cava.

The purpose of this study was to evaluate the CT findings of pulmonary artery aneurysms in patients being treated for Behçet's disease. Thirteen patients with Behçet's disease who had a total of 46 aneurysms were included in the study. All patients underwent helical CT before and after treatment. Both initial and follow-up CT scans were evaluated f...

Thalassemia is a kind of chronic, inherited, microcytic anemia characterized by defective hemoglobin synthesis and ineffective erythropoiesis. In all thalassemias clinical features that result from anemia, transfusional, and absorptive iron overload are similar but vary in severity. The radiographic features of beta-thalassemia are due in large par...

Leiomyomas can arise from any tissue having smooth muscle as one of its constituents, especially gastrointestinal and genitourinary systems, less frequently in the skin, and rarely in deep soft tissue. An unusual case of multiple vascular leiomyomas involving bilateral adrenal glands, spleen, and epicardium, associated with bilateral testicular mic...

To evaluate the usefulness of self-expanding nitinol stents in the palliative treatment of malignant dysphagia. Eighty self-expanding nitinol stents were placed in 59 patients (43 men, 16 women; mean age, 55 years; age range, 23-75 years) with inoperable malignant stenosis due to squamous cell carcinoma of the esophagus (n = 36), adenocarcinoma (n...

Scimitar syndrome is a rare congenital pulmonary anomaly that is characterized by hypoplasia of the right lung and the right pulmonary artery with anomalous pulmonary venous drainage to the inferior vena cava or the right atrium. Very few reports are available that analyze the value of magnetic resonance imaging (MRI) in establishing the diagnosis....

Behçet's disease is a rare form of vasculitis of obscure etiology. Any large or small artery, vein, or organ may be involved in an unpredictable combination. Intrathoracic manifestations of Behçet's disease consist mainly of thromboembolism of the superior vena cava and/or other mediastinal veins; aneurysms of the aorta and pulmonary arteries; pulm...

CT findings in pulmonary Gaucher's disease have not been previously reported. Chest radiograph of a patient with pulmonary involvement in type I Gaucher's disease proven by biopsy showed linear and reticulo-nodular opacities. High-resolution CT demonstrated thickening of the interlobular septa and between four and six small nodules within secondary...

Renal perfusion MRI is achieved through first-pass imaging after an IV MR contrast agent injection. Kidney function can be characterized by qualitatively or quantitatively analyzing the signal intensity-time curves. Automated analysis of perfusion is complicated due to inadvertent patient and respiratory motion. Since the breath-holding techniques...

PURPOSE/AIM Sarcoidosis is a multisystem chronic inflammatory disease with thorax being the most commonly site involved. Apart from the commonly encountered typical manifestations, rarely encountered findings such as unilateral or isolated lymphadenopathy, airway consolidation, ground-glass, linear or miliary opacities, fibrocystic changes, mosaic...

PURPOSE/AIM To define CT changes of pulmonary artery aneurysms in patients with Behcet’s disease during treatment. CONTENT ORGANIZATION Behcet’s disease is a chronic multisystemic vasculitis of unknown etiology. The disease can be manifested by aneurysms and arterial and venous occlusions. The pulmonary arteries and aorta are the most common sites...