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…
Tag: Radiology
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…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Chest X-ray: Alveolar vs Interstitial Disease
Interstitium is the scaffolding that supports the alveolar walls and surrounds both the alveoli and the terminal bronchioles. Neither alveoli nor interstitium is visible on a chest X-ray when normal. It is necessary to analyze whether the pattern of diffuse opacification in the lung field is alveolar or interstitial. Terms:…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Systematic Approach to Frontal Chest X-ray
To make an appropriate diagnosis through a chest radiograph, it must be analyzed in a systematic manner. One of the common mistakes that students do is to miss the regions that needs to be looked for – commonest being the rib fractures. A mnemonic has been devised for this purpose:…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Anatomy of Ostiomeatal complex
Synonyms: Ostiomeatal unit, Osteomeatal complex, OMC Definition: The term “ostiomeatal unit” represents the area on the lateral nasal wall (middle meatus) that receives drainage from the anterior and medial ethmoid cells, frontal sinus, and maxillary sinus. It is an antomically constricted area that is prone to blockage, especially in the…