Subscribe
22
Shen Jiang Chao
Radiology
About me
Having worked in the field of radiology for 20 years, currently working at the Radiology Department of Shaoxing Central Hospital, promoted to Associate Chief Physician in 2016. I have rich experience in diagnosing chest, abdomen, and musculoskeletal imaging, particularly in the diagnosis of systemic tumors. I have participated in various medical continuing education training programs and have published several papers in multiple core journals.
Proficient in diseases
Lung cancer, liver cancer, abortion, adrenal tumor, hepatitis B, vascular tumor, intracranial tumor, uterine tumor, cervical cancer.
Voices
Fatty liver MRI manifestations
Fatty liver, also known as hepatic steatosis, typically appears normal in most cases on MRI. However, a minority of cases may show high signals on T1 and T2. In fat-suppressed sequences, the high signals disappear after the fat is suppressed, appearing as low signal shadows. MRI has a specific sequence for examining fatty liver, known as the dual-echo sequence, which includes two sequences: one is the in-phase sequence and the other is called the opposed-phase sequence. The in-phase sequence examines the liver parenchyma, while a characteristic feature in the opposed-phase sequence is the significant decrease in signal in areas of fatty metamorphosis.
Epididymal cyst B-ultrasound manifestations
Epididymal cysts are formed due to the dilation of the efferent ductules and localized blockage of the epididymal duct, and they typically have characteristic appearances on ultrasound, showing as single or multiple anechoic areas. Epididymal cysts are usually located within the head of the epididymis and appear round or oval in shape with clear boundaries, varying in size from a few millimeters to several centimeters. The cyst walls are thin, with good internal sound transmission, and there are generally no significant blood flow signals inside the cysts. Some parts of the cyst walls may calcify, appearing as strong echoic shadows. Epididymal cysts are a type of benign lesion.
Subarachnoid Hemorrhage CT Imaging Manifestations
Subarachnoid hemorrhage is caused by the rupture of cerebral blood vessels due to various reasons, allowing blood to flow into the subarachnoid space. Common causes include trauma and rupture of congenital aneurysms. Subarachnoid hemorrhage caused by the rupture of congenital aneurysms typically presents on a CT scan with high-density appearances at the base of the skull in the brain pools, especially widespread columnar high-density appearances in the suprasellar cistern, lateral fissure cistern, anterior interhemispheric fissure, and around the circumferential pool. If the subarachnoid hemorrhage is due to trauma, the abnormalities are more localized, generally appearing in the brain pool or cerebral sulcus on the side of injury with high-density appearances, and may also be accompanied by hematomas within the ventricles or bleeding in other locations.
Can pancreatic cancer be detected by a CT scan?
Pancreatic cancer can be detected by CT, which shows both direct and indirect signs. The direct signs of pancreatic cancer are manifested as pancreatic masses, which are mostly lobulated. On plain scans, the tumor appears isodense or slightly hypodense compared to the pancreatic parenchyma. When the tumor is large, it appears as a local protrusion, mostly located within the pancreas. In the early phase after enhancement, the tumor enhances less than the surrounding normal pancreatic tissue because pancreatic cancer is a hypovascular tumor. Indirect signs are mainly secondary changes caused by pancreatic cancer, mainly affecting the common bile duct and the main pancreatic duct, which can lead to pancreatic duct dilation, characterized by the typical double duct sign.
Teratoma B-ultrasound manifestation
Teratomas are tumors that occur in germ cells and can develop in many parts of the body. For example, they can occur within the central nervous system, mediastinum, and pelvic cavity, with the latter being more common. On ultrasound, teratomas have typical features, mainly presenting as abnormal masses. These masses predominantly show mixed echogenicity, with strong echogenicity being more pronounced, appearing as strongly echogenic masses. The strong echogenicity primarily refers to contents including teeth, and also visible are areas of medium to low echogenicity, which are mainly composed of fat and hair. Benign teratomas have smooth borders, while malignant teratomas have irregular borders and are generally larger in size.
Ultrasound manifestation of renal cancer
Kidney cancer is the most common type of kidney malignancy. Pathologically, it is mainly divided into clear cell renal cell carcinoma, chromophobe renal cell carcinoma, papillary renal carcinoma, and collecting duct carcinoma, with clear cell renal cell carcinoma being the most common. Ultrasonographically, it usually appears as round or oval masses, varying in size but generally around 2-4 cm, exhibiting low to medium echo patterns. If the tumor is larger, greater than 5 cm, it may show changes in mixed echo patterns due to possible internal bleeding or cystic changes when the tumor is large. When kidney cancer is suspected on ultrasound, it is best to further proceed with enhanced MRI or enhanced CT scanning.
Difference between liver hemangioma and liver cancer in ultrasound
Liver hemangiomas display a variety of appearances on ultrasound, including hyper-echoic, hypo-echoic, and mixed echoes. Typically, hemangiomas appear on ultrasound as round or oval hyper-echoic masses, with internal echoes that may show a sieve-like change. In contrast, liver cancer primarily appears as hypo-echoic on ultrasound, and liver cancer symptoms are more varied because most liver cancers develop on the basis of cirrhosis. In addition to hypo-echoic masses, there are other manifestations, such as an incomplete liver capsule, widened liver fissures, spleen enlargement, and dilated portal veins, which are used to differentiate from hemangiomas.
Gallbladder cancer CT manifestations
Gallbladder cancer commonly occurs in females, and its causes may be related to chronic and long-term irritation from cholecystitis and gallstones. On a CT scan, based on the tumor's pathological classification and growth patterns, it can be divided into the following types: The first type is the infiltrative type, which is characterized by irregular thickening of the gallbladder wall, usually greater than 1 cm, with a rough edge, and significant enhancement is seen after contrast enhancement. The second type is the mass-forming type, which presents as a large soft tissue mass filling the gallbladder, also showing significant enhancement after injection of contrast agent. The third type is the nodular type, which presents as either single or multiple nodules that protrude into the gallbladder cavity, appearing papillary or cauliflower-like. The fourth type is the obstructive type, generally a tumor at the neck of the gallbladder, causing obstruction of the common bile duct.
Pleural inflammation CT manifestations
The causes of pleurisy mainly include tuberculous, purulent, bacterial, tumorous, traumatic, and rheumatic types, with the tuberculous type being the most common. Pleurisy is predominantly characterized by pleural effusion, which generally looks similar on a CT scan. CT scans cannot distinguish the cause of pleurisy. A small amount of pleurisy manifests as a minor amount of free effusion, appearing as an arc or crescent of uniform density along the posterior chest wall. As the effusion gradually increases to a moderate or large amount, it can compress lung tissue, leading to compressive atelectasis. In cases of large volume effusion, aside from causing atelectasis, it can also significantly push the mediastinum towards the healthy side.
Gallbladder stones CT manifestations
Gallstones typically display characteristic features on a CT scan. Depending on the calcium content and the chemical composition of the stones, they can appear as high-density, isodense, or low-density stones. High-density stones present as multiple areas of increased density within the gallbladder, though they can also be solitary. A solitary high-density stone generally appears as a concentric circle with low central density surrounded by high density. Isodense stones have the same density as bile, which sometimes makes them difficult to distinguish. Low-density stones, which are primarily cholesterol stones, can sometimes contain gas, appearing as low-density shadows. CT is not the first choice for diagnosing gallstones; abdominal ultrasound is generally preferred.