1. Classic presentation is normal X-ray in patient with dyspnea and hypoxia 2. Atelectasis or parenchymal abnormality (68%) 3. Elevated hemidiaphragm 4. Pleural effusion (Felson’s sign – pleural effusion on left > right) 5. Hampton’s hump: peripheral pleural based wedge-shaped density above the diaphragm due to pulmonary infarct 6. Westermark’s…
Tag: Radiology
PGMEE, MRCS, USMLE, MBBS, MD/MS
Rib Notching
Normal Rib Notching A small notch near the costo-vertebral joint is normal, so pathologic rib notching is more likely if the notching is more lateral. Types of Pathological Rib Notching 1. Superior rib notching 2. Inferior rib notching (more common) Inferior Rib Notching (Roesler’s sign) Mechanism: Enlargement of one or…
PGMEE, MRCS, USMLE, MBBS, MD/MS
Silhouette and Cervico-thoracic sign
Synonyms: Obscured margin sign, Loss of outline sign Silhouette refers to the shadow and derived it’s origin from shadow papercuts done by Etienne de Silhouette. Principle of Silhouette sign On a normal Chest X-ray the well-defined borders of the heart and the domes of the diaphragm are visualised because the adjacent…
PGMEE, MRCS, USMLE, MBBS, MD/MS
Ball-on-Tee, Lobster Claw and Signet Ring Sign – Renal papillary necrosis
Synonym: Necrotizing papillitis In renal papillary necrosis, part or all of necrotic renal papilla sloughs and may fall into the pelvicalyceal system, which may remain there (and get calcified) or may be voided down the ureter (often causing obstruction). The renal medulla and papillae are vulnerable to ischemic necrosis because…
PGMEE, MRCS, USMLE, MBBS, MD/MS
Liver Segments Explained with Mnemonic
Couniaud divided liver into 8 functional segments, each of which is supplied by it’s own portal triad (composed of a portal vein, hepatic artery and a bile duct). Hepatic veins divide the liver in saggital plane: 1. Middle hepatic vein: Divides the liver into right and left functional lobe. 2….
PGMEE, MRCS, USMLE, MBBS, MD/MS
Omental Cake
Definition of Omental Caking Thickening of the omentum resulting from localized or diffuse infiltration of omental fat by soft tissue density mass is referred as “omental caking”. It is a radiological sign, which is often identified in CT scan. Involved Anatomical Structure in Omental Caking Greater Omentum – an extension of…
PGMEE, MRCS, USMLE, MBBS, MD/MS
Chest Xray – Approach to hilum
Hilum in human anatomy refers to the depression where structures such as blood vessels and nerves enter an organ. The structures contributing to hilar shadows in a Chest X-ray are: Major: Pulmonary artery and veins Minor: Fat, Lymph nodes and Bronchial walls Normal Hilum: Position: Left hilum is slightly higher…
PGMEE, MRCS, USMLE, MBBS, MD/MS
Chest X-ray – Pleural Effusion
Pleura is a mesothelial lined sac that envelopes the lungs and comprises of 2 membranous walls i.e. visceral pleura and parietal pleura that encloses pleural space filled with pleural fluid. Pleural space contains about 0.3 ml/kg body weight of pleural fluid. The pleura is not visible on a normal CXR…