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Accessory parotid glands are a normal variant and represent ectopic salivary tissue present away and separate from the main parotid gland.  located on the masseter muscle, anterior to the main parotid gland, in close association (usually above) or anterior to the Stensen's duct  accessory parotid glands have their own blood supply and secondary duct emptying into the Stensen's duct.  http://radiopaedia.org/articles/accessory-parotid-glands

Accessory parotid glands are a normal variant and represent ectopic salivary tissue present away and separate from the main parotid gland. located on the masseter muscle, anterior to the main parotid gland, in close association (usually above) or anterior to the Stensen's duct accessory parotid glands have their own blood supply and secondary duct emptying into the Stensen's duct. http://radiopaedia.org/articles/accessory-parotid-glands

Cerebellar agenesis is a rare congenital abnormality which can result from failure to develop normal cerebellar tissue or destruction of normally developed tissue. Typically small remnants of the cerebellum are present, including cerebellar peduncles and vermian lobules, and as such the term subtotal cerebellar agenesis is often used.   http://radiopaedia.org/articles/cerebellar-agenesis

Cerebellar agenesis is a rare congenital abnormality which can result from failure to develop normal cerebellar tissue or destruction of normally developed tissue. Typically small remnants of the cerebellum are present, including cerebellar peduncles and vermian lobules, and as such the term subtotal cerebellar agenesis is often used. http://radiopaedia.org/articles/cerebellar-agenesis

Abdominal aortic aneurysm (AAA) rupture is a feared complication of abdominal aortic aneurysm and is a surgical emergency.  Retroperitoneal haemorrhage adjacent the aneurysm is the most common finding. The peri-aortic blood may be seen to extent into perirenal or pararenal spaces, or the psoas muscles. Intraperitoneal extension of the haemorrhage may be seen as an immediate or a delayed finding.   http://radiopaedia.org/articles/abdominal-aortic-aneurysm-rupture-2

Abdominal aortic aneurysm (AAA) rupture is a feared complication of abdominal aortic aneurysm and is a surgical emergency. Retroperitoneal haemorrhage adjacent the aneurysm is the most common finding. The peri-aortic blood may be seen to extent into perirenal or pararenal spaces, or the psoas muscles. Intraperitoneal extension of the haemorrhage may be seen as an immediate or a delayed finding. http://radiopaedia.org/articles/abdominal-aortic-aneurysm-rupture-2

Pilomyxoid astrocytomas (PMA) are a recently described variant of pilocytic astrocytoma (PA) with unique clinical and histopathologic characteristics. It is considered a WHO grade II tumour.  These tumours are usually large, well-circumscribed, lobulated and may have solid or cystic components. Haemorrhagic components may be present.   http://radiopaedia.org/articles/pilomyxoid-astrocytoma

Pilomyxoid astrocytomas (PMA) are a recently described variant of pilocytic astrocytoma (PA) with unique clinical and histopathologic characteristics. It is considered a WHO grade II tumour. These tumours are usually large, well-circumscribed, lobulated and may have solid or cystic components. Haemorrhagic components may be present. http://radiopaedia.org/articles/pilomyxoid-astrocytoma

An azygos lobe is created when a laterally displaced azygos vein makes a deep pleural fissure into the apical segment of the right upper lobe during embryological development. It is a normal anatomic variant of the right upper lobe due to invagination of the azygos vein.   The azygos lobe is usually well seen on the chest radiograph, where it is limited by the azygos fissure.  http://radiopaedia.org/articles/azygos-lobe

An azygos lobe is created when a laterally displaced azygos vein makes a deep pleural fissure into the apical segment of the right upper lobe during embryological development. It is a normal anatomic variant of the right upper lobe due to invagination of the azygos vein. The azygos lobe is usually well seen on the chest radiograph, where it is limited by the azygos fissure. http://radiopaedia.org/articles/azygos-lobe

Pericardial effusions occur when fluid collects in the pericardial space (a normal pericardiac sac contains approximately 30-50 ml of fluid).   CT makes the diagnosis extremely easy, but is usually obtained to try and clarify the cause of an effusion rather than to confirm the diagnosis. Pericardial effusions are a frequent incidental finding in unwell hospitalised patients.   http://radiopaedia.org/articles/pericardial-effusion

Pericardial effusions occur when fluid collects in the pericardial space (a normal pericardiac sac contains approximately 30-50 ml of fluid). CT makes the diagnosis extremely easy, but is usually obtained to try and clarify the cause of an effusion rather than to confirm the diagnosis. Pericardial effusions are a frequent incidental finding in unwell hospitalised patients. http://radiopaedia.org/articles/pericardial-effusion

As the lens of the eye is sensitive to radiation, some institutions provide eye shields during brain scan to minimize eyes irradiation. This protection has been related up to a 50% reduction in radiation to the lens of the eye  0b3b31a2a31a7361a2f9cb73a72dc1_big_gallery

As the lens of the eye is sensitive to radiation, some institutions provide eye shields during brain scan to minimize eyes irradiation. This protection has been related up to a 50% reduction in radiation to the lens of the eye 0b3b31a2a31a7361a2f9cb73a72dc1_big_gallery

Accessory lateral gastrocnemius muscle can be a cause of popliteal entrapment syndrome | Radiology Case contributed by Dr Paresh K Desai | Radiopaedia.org

Accessory lateral gastrocnemius muscle can be a cause of popliteal entrapment syndrome | Radiology Case contributed by Dr Paresh K Desai | Radiopaedia.org

Annular pancreas is a morphological anomaly which can cause duodenal obstruction. This condition is important to recognise, because radiologists are usually the first person to diagnose such a condition.  http://radiopaedia.org/articles/annular-pancreas

Annular pancreas is a morphological anomaly which can cause duodenal obstruction. This condition is important to recognise, because radiologists are usually the first person to diagnose such a condition. http://radiopaedia.org/articles/annular-pancreas

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