ABSTRACT
PURPOSE: In this systematic review and individual patient data (IPD) meta-analysis, we analysed the diagnostic performance of [18F]FDG PET/CT in detecting primary tumours in patients with CUP and evaluated whether the location of the predominant metastatic site influences the diagnostic performance. METHODS: A systematic literature search from January 2005 to February 2024 was performed to identify articles describing the diagnostic performance of [18F]FDG PET/CT for primary tumour detection in CUP. Individual patient data retrieved from original articles or obtained from corresponding authors were grouped by the predominant metastatic site. The diagnostic performance of [18F]FDG PET/CT in detecting the underlying primary tumour was compared between predominant metastatic sites. RESULTS: A total of 1865 patients from 32 studies were included. The largest subgroup included patients with predominant bone metastases (n = 622), followed by liver (n = 369), lymph node (n = 358), brain (n = 316), peritoneal (n = 70), lung (n = 67), and soft tissue (n = 23) metastases, leaving a small group of other/undefined metastases (n = 40). [18F]FDG PET/CT resulted in pooled detection rates to identify the primary tumour of 0.74 (for patients with predominant brain metastases), 0.54 (liver-predominant), 0.49 (bone-predominant), 0.46 (lung-predominant), 0.38 (peritoneal-predominant), 0.37 (lymph node-predominant), and 0.35 (soft-tissue-predominant). CONCLUSION: This individual patient data meta-analysis suggests that the ability of [18F]FDG PET/CT to identify the primary tumour in CUP depends on the distribution of metastatic sites. This finding emphasises the need for more tailored diagnostic approaches in different patient populations. In addition, alternative diagnostic tools, such as new PET tracers or whole-body (PET/)MRI, should be investigated.
ABSTRACT
Magnetic resonance imaging (MRI) plays a significant role in the routine imaging workflow, providing both anatomical and functional information. 19F MRI is an evolving imaging modality where instead of 1H, 19F nuclei are excited. As the signal from endogenous 19F in the body is negligible, exogenous 19F signals obtained by 19F radiofrequency coils are exceptionally specific. Highly fluorinated agents targeting particular biological processes (i.e., the presence of immune cells) have been visualised using 19F MRI, highlighting its potential for non-invasive and longitudinal molecular imaging. This article aims to provide both a broad overview of the various applications of 19F MRI, with cancer imaging as a focus, as well as a practical guide to 19F imaging. We will discuss the essential elements of a 19F system and address common pitfalls during acquisition. Last but not least, we will highlight future perspectives that will enhance the role of this modality. While not an exhaustive exploration of all 19F literature, we endeavour to encapsulate the broad themes of the field and introduce the world of 19F molecular imaging to newcomers. 19F MRI bridges several domains, imaging, physics, chemistry, and biology, necessitating multidisciplinary teams to be able to harness this technology effectively. As further technical developments allow for greater sensitivity, we envision that 19F MRI can help unlock insight into biological processes non-invasively and longitudinally.
ABSTRACT
INTRODUCTION AND IMPORTANCE: Cyclopia is a rare congenital disorder characterized by facial abnormalities. In this condition, the orbits of the eye are not properly divided into two cavities so that they can be seen either as a single eye field or two bilateral fields that are very close to each other. This syndrome affects the embryos that are either aborted or stillborn upon delivery or, at best, die shortly after birth. CASE PRESENTATION: This case report is of a 37-week- and 5-day-old female fetus with a birth weight of 2300 g, a height of 43 cm, and a head circumference of 31 cm. She was born to a 44-year-old mother through normal vaginal delivery at Mahzad Hospital, Urmia, Iran. In the physical examination, an eye and a 4-cm proboscis were seen in the middle of the forehead. The newborn also had no nose, and his outer ears were normal. No cleft lip or cleft palate was observed. Unfortunately, the newborn expired 13 h after birth. CLINICAL DISCUSSION: Cyclopia leads to a stillbirth since the brain and other parts of the body do not grow normally in fetuses with this disorder. Moreover, it can be diagnosed using ultrasonography while the fetus is growing inside the uterus. CONCLUSION: Early diagnosis during pregnancy using diagnostic methods and proper management of this abnormality should be emphasized to prevent further harm to the newborn and the mother with this syndrome. Moreover, many of these newborns should be offered early neonatal palliative care.
ABSTRACT
INTRODUCTION AND IMPORTANCE: The Peripherally Inserted Central Catheter (PICC) placement is associated with complications such as deep vein thrombosis, phlebitis, air embolism, infection, and superior vena cava syndrome. The aim of this study is to report pneumothorax as a rare complication of PICC insertion in a newborn. CASE PRESENTATION: The present case report is of a 32-week- and 4-day-old female fetus who was born at Mahzad Obstetrics and Gynecology Hospital, Urmia, Iran. A PICC was placed for the infant. The infant underwent an antero-posterior chest X-ray, in which the presence of a complete white-out of the right hemithorax indicated pneumothorax and right lung collapse. The review of literature in this field showed that there were no reports of pneumothorax as a complication of PICC insertion in neonates. CLINICAL DISCUSSION: Despite that the PICC placement seems to have many medical advantages in infants, it may cause life-threatening complications such as pneumothorax. In this newborn, the PICC placement was the main cause of pneumothorax and it can be stated that the catheter tip might cause trauma to the chest wall during the placement procedure which resulted in an air trap in the pleural cavity and eventually right lung collapse. CONCLUSION: There are a couple of rare cases being reported to have complications of PICC placement in neonates, but none had associated pneumothorax and PICC placement in neonates. Therefore, innovative methods require to be used for meeting the nutrition and fluid requirements of the infants for a long time.