ON - RADIOLOGY

FAST RUQ Exam - Normal Exam

2011-10-10T13:24:00.000-07:00

Molar pregnancy....snow white appearance on ultrasound

2011-08-15T16:43:00.000-07:00

Molar pregnancies are an uncommon and very frightening complication of pregnancy and occurs due to an abnormal fertilization process.The formal medical term for a molar pregnancy is "hydatidiform mole."

The diagnosis of molar pregnancy can nearly always be made by ultrasound, because the chorionic villi of a typical complete mole proliferate with vacuolar swelling and produce a characteristic vesicular sonographic pattern.
• Previously when the diagnosis was made at a later stage, the classical ‘snowstorm’ pattern of the uterus was described; however this is not commonly seen now.

Scan of the uterus shows the classical bunch-of-grapes appearance or snow-storm appearance in the uterine cavity is noted. This is the typical appearance of a gestational trophoblastic disease.

• Benson et al reported that the majority of first trimester complete moles demonstrated a typical
sonographic appearance of a complex and echogenic intrauterine mass containing many small
cystic spaces {which correspond to the hydropic villi on gross pathology}.

Your Radiologist Explains: Brain MRI

2011-08-09T06:00:00.000-07:00

X-ray Osgood-Schlatter disease

2011-08-07T16:26:00.000-07:00

Osgood Schlatters disease is a very common cause of knee pain in children and young athletes usually between the ages of 10 and 15. It occurs due to a period of rapid growth, combined with a high level of sporting activity.

Imaging Findings

* Normal x-ray findings do not exclude the disease, which is diagnosed clinically
* Radiographs have Limited role "Clinical diagnosis"...............

Hallux varus in X-ray

2011-08-05T05:40:00.000-07:00

Hallux varus is a deformity of the great toe joint where the hallux is deviated medially (towards the midline of the body) away from the first metatarsal bone. The hallux usually moves in the transverse plane.
The condition has various degrees ..............

Acute pulmonary edema following surgery

2011-07-27T14:52:00.000-07:00

This patient became acutely short of breath following surgery. Why is this an emergency? The patient has:

a. Left lower lobe pneumonia.
b. Acute pulmonary edema.
c. A large pneumothorax.
d. A large pericardial effusion.
e. A ruptured gastric ulcer.

Correct Answer: Acute pulmonary edema.

Explanation

There is diffuse airspace disease in both lungs causing almost complete opacification of both lungs. This came on suddenly and is characteristic of pulmonary edema. Other fluids can inhabit the airspaces such as blood or gastric aspirate, but they have different clinical stories and are less common than acute pulmonary edema. This patient had been hypotensive and was suffering from non-cardiogenic pulmonary edema. Vasopressors and diuretics were used in his treatment.

Scaphoid fractures overview

2011-07-24T22:50:00.000-07:00

A Scaphoid fracture is the most common type of wrist fracture which is almost always caused by a fall on the outstretched hand..Scaphoid fractures usually cause pain and swelling at the base of the thumb. The pain may be severe when you move the thumb or wrist, or when the patient try to grip something.
Anatomic snuffbox tenderness is a highly sensitive test for scaphoid fracture, whereas scaphoid compression pain and tenderness of the scaphoid tubercle tend to be more specific. Initial radiographs in patients suspected of having a scaphoid fracture should include anteroposterior, lateral, oblique, and scaphoid wrist views..........

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Torn Meniscus Cartilage Overview

2011-07-21T02:38:00.000-07:00

Congenital aortic stenosis in X-ray

2011-07-08T03:50:00.000-07:00

In Supravalvular aortic stenosis you can see Aortic knob is often small due to underdevelopment and stenosis of the supravalvular portion of the aorta. Different from the poststenotic aortic dilation that occurs with valvular aortic stenosis.

Congenital aortic stenosis. Small aortic arch with moderate enlargement of the left ventricle.

Indications of Thumbprint sign in Chest & Abdominal X-ray

2011-07-04T15:29:00.000-07:00

the thumbprint sign is a finding on a lateral C-spine radiograph that suggests the diagnosis of epiglottitis. The sign is caused by a thickened free edge of the epiglottis, which causes it to appear more radiopaque than normal, resembling the distal thumb.

Thumb’ like epiglottitis. Note the swollen epiglottitis like a thumbprint

" enlarged epiglottis in epiglottitis which, instead of its usual thin fingerlike projection, is stubby, like the thumb "

In an abdominal x-ray, the "thumb print sign" has similar appearance of thumbs protruding into the intestinal lumen, but are in fact caused by thickened edematous mucosal folds. Abdominal thumbprinting a sign of intestinal ischemia.

Thumbprinting-indentation in contrast or air-filled bowel lumen caused by submucosal infiltration and resembling a thumbprint; eg ischemia

Pericardial Effusion Vs Pleural Effusion

2011-06-17T02:15:00.000-07:00

Usually pericardial effusion(PE) is not found behind the left atrium,because the pericardial attachments are refleted onto the pulmonary veins.Somtimes,PE can be visualized in the oblique sinus,which is located behind the LA. A PE is anterior to the descending aorta,whereas a pleural effusion(PL) is posterior to the aorta.

What are Occipito-mental Views ? And lines for inspection.

2011-06-10T05:33:00.000-07:00

(click on images to enlarge)

Occipito-mental View

The PA occipito-mental view provides excellent demonstration of the upper and middle thirds of the face including the orbital margins, frontal sinuses, zygomatic arches and maxillary antra.

Occipito-mental 30 View :

With 30 degrees of caudal angulation, the orbits are demonstrated less well. However, the zygomatic arches and the walls of the maxillary antra are seen clearly.

There are 3 lines for inspecting the OM views:

Line 1:

Look for widening of the zygomatico-frontal sutures
Fractures of the superior rim of the orbits
“Black-Eyebrow” sign due to orbital emphysema
Opacification / air-fluid level in the frontal sinuses

Line 2:

Look for fractures of the superior aspect of the zygomatic arch
Fractures of the inferior rim of the orbits
Soft tissue shadow in the superior maxillary antrum
Fractures of the nasoethmoid bones and medial orbits

Line 3:

Look for fractures of the inferior aspect of the zygomatic arch
Fractures of the lateral maxillary antrum
Opacification / air-fluid level in the maxillary sinuses
Fractures of the alveolar ridge
Compare the injured side with the uninjured side.

Long Case Discussion in Radiology

2011-06-07T14:36:00.000-07:00

Noncontrast helical CT is the most sensitive and specific for the detection of renal stones

2011-06-06T13:09:00.000-07:00

Which of the following tests is the most sensitive and specific for the detection of renal stones?

A) KUB plain film
B) Ultrasound
C) Intravenous pyelography
D) Noncontrast helical CT

The answer is D.

Compared with abdominal ultrasonography and KUB radiography, intravenous pyelography has greater sensitivity (64% to 87%) and specificity (92% to 94%) for the detection of renal calculi. Noncontrast helical CT is being used increasingly in the initial assessment of renal colic.
This imaging modality is fast and accurate, and it readily identifies all stone types in all locations. Its sensitivity (95% to 100%) and specificity (94% to 96%) suggest that it may definitively exclude stones in patients with abdominal pain.

Multiple transverse nonenhanced CT images demonstrate numerous 3-5-mm renal calculi (arrows) that were not depicted at US.

Chest -- CT scan describtion of Monod sign

2011-06-01T21:32:00.000-07:00

Ultrasound image of a normal eye with lens

2011-05-18T14:25:00.000-07:00

Since the eye is a fluid-filled structure, it provides a perfect acoustic window, producing images with excellent detail. The normal eye appears as a circular hypoechoic structure. The cornea is seen as a thin hypoechoic layer parallel to the eyelid.
The anterior chamber is filled with anechoic fluid and is bordered by the cornea, iris and anterior reflection of the lens capsule. The iris and ciliary body are seen as echogenic linear structures extending from the peripheral globe towards lens. The normal lens is anechoic. The normal vitreous chamber is filled with anechoic fluid. Vitreous is relatively echolucent in a young healthy eye.

Sonographically, the normal retina cannot be differentiated from the other choroidal layers. The evaluation of the retrobulbar area includes optic nerve, extraocular muscles and bony orbit. The optic nerve is visible posteriorly as a hypoechoic linear region radiating away from globe.

Normal ocular ultrasound

Ultrasound image of a normal eye with lens

Recurrent Pyogenic Cholangitis (RPC)

2011-05-17T03:14:00.000-07:00

Recurrent pyogenic cholangitis,Cholangiohepatitis, is an uncommon disease in the western world Most of these cases are seen in Asian countries.
The etiology is unknown, although some of these patients have biliary parasites.
The disease is characterized by a recurrent syndrome of bacterial cholangitis that occurs in association with intrahepatic pigment stones and intrahepatic biliary obstruction.
-These patients are also at risk of developing biliary cirrhosis and cholangiocarcinoma.
-The left lobe is the most common location of the disease due to the delayed drainage of the left system.

This C.T. image shows a typical case of Recurrent pyogenic cholangitis

There is focal dilatation of the bile ducts in the left lobe with stones.

Below there is another example of recurrent pyogenic cholangitis.There is intrahepatic lithiasis with focal diatation.
A case like this is indistinguishable from focal Caroli disease with secundary stone formation.

Causes of lung collapse

2011-05-11T12:10:00.000-07:00

Lung collapse usually occurs due to proximal occlusion of a bronchus, causing a loss of aeration. The remaining air is gradually absorbed, and the lung loses volume.

There are many causes for collapse, the most frequent are listed below:

* The commonest cause is a proximal stenosing bronchogenic carcinoma, which occludes a bronchus. Patients are middle aged or elderly, and almost always smokers.

* In a young adult or older child asthma is by far the commonest cause. Collapse occurs secondary to mucous plugging of the major airways, and responds to physiotherapy.
* In an infant consider an inhaled foreign body, such as a peanut.

* Retention of secretions is a frequent cause of post operative collapse.

* In ventilated patients, including neonates, collapse may occur if the endotracheal tube is inserted too far, entering one main bronchus and occluding the other as shown below:

Complete collapse of the right lung in this case was caused by an endotracheal tube that was advanced too far and entered the left mainstem bronchus. The heart is not seen as the mediastinum is shifted to the right. There is overinflation of the left lung, also contributing to the mediastinal shift.

Ultrasound showing Bilateral communicating hydrocele in neonate

2011-05-07T09:01:00.000-07:00

The below ultrasound images show gross bilateral communicating hydrocele in a neonate, which was found to have Hydrops fetalis in utero. Note the presence of ascitic fluid with communication with the hydrocele (arrow in last figure below).

Benefits of Schüller view on showing Mastoid bone

2011-05-03T10:32:00.000-07:00

Schüller's view (Runstrom) is a lateral view of the mastoid obtained with the sagittal
plane of the skull parallel to the film and with a 30° cephalocaudal angulation of the x-ray beam.

These 30° in Schüller's view displaces the arcuate eminence of the petrous bone downward and shows the antrum and the upper part of the attic.

Schüller's view also gives an excellent view of the extent of the pneumatization of the mastoid,the distribution and the degree of aeration of the air cells, the status of the trabecular pattern, and the position of the vertical portion of the lateral sinus.

Schüller view: Well-developed normally pneumatized mastoidal air cells can be observed in the picture on the left side (double arrow). In the picture on the right side, the mastoid cells (arrow) are obscured, and not air-containing, due to chronic otitis media.

Characteristic black pleura‌ sign in Alveolar microlithiasis in chest X-ray

2011-04-24T14:37:00.000-07:00

Alveolar microlithiasis is a rare disease of unknown etiology characterized by the presence of a myriad of very fine micronodules of calcific density in the alveoli of the lungs of a usually asymptomatic person. Characteristic black pleura‌ sign (due to contrast between the extreme density of the lung parenchyma on one side of the pleura and the ribs on the other side).

Alveolar microlithiasis appears in Chest X-ray as diffuse, very fine micronodules of calcific density that are usually asymptomatic. Characteristic black pleura sign (it is due to contrast between the extreme density of the lung parenchyma on one side of the pleura and the ribs on the other side).

Alveolar microlithiasis. Nearly uniform distribution of typical fine, sandlike mottling in the lungs. The tangential shadow of the pleura is displayed along the lateral wall of the chest as a dark lucent strip (arrows).

Blunt trauma to pancreas

2011-04-15T12:25:00.000-07:00

• Blunt trauma to pancreas is usually caused by compression against the vertebral column; the best and most common example is seat belt compression injuries. Blunt trauma to pancreas is Usually associated with upper abdominal visceral injury.
• Graded from minor contusion and capsular haematoma (grade I) to severe devascularising crush injury (grade IV).
• Pancreatic trauma is usually damage occurs at most vulnerable segment of pancreas: the junction of the body and tail.

Radiological features

- CECT:
•Laceration–area of intrapancreatic low attenuation, often difficult to see.
•Direct evidence of haemorrhage – fluid around superior mesenteric artery and pancreas.
•Indirect evidence – thickening of anterior pararenal fascia.
- Often requires delayed scans to exclude/monitor complications of pancreatitis and devascularised pancreas.

Complications of Blunt trauma to pancreas

• Post-traumatic pancreatitis, with:

peripancreatic fat stranding
diffuse or focal pancreatic enlargement
irregular pancreatic contour.

• Splenic vessel fistula or arterial pseudoaneurysm.
• Pancreatic abscess.
• Pancreatic pseudocyst.

Pancreatic trauma. Laceration of the pancreas within the proximal body (arrow heads).

Radiographic anatomy of Paediatric Shoulder

2011-04-12T14:00:00.000-07:00

This page contains normal radiographic anatomy of the paediatric shoulder

Images on this page :
* AP
* Lateral
* SI

Paediatric Shoulder - AP

Paediatric Shoulder - Lateral

Paediatric Shoulder - Superiorinferior view (SI)

Source :www.wikiradiography.com

Free floating particles in Liqor amnii

2011-04-11T18:55:00.000-07:00

This was a 38 week old pregnancy showing multiple echogenic particles in the amniotic fluid (liqor amnii) on ultrasound/ Color Doppler imaging. Such freely mobile particles in the amniotic fluid are called free floating particles and are commonly seen in the 3rd trimester. Sometimes, particulate debris, when abundant, can be confused with normal umbilical cord floating in the amniotic fluid, on grey scale B-mode ultrasound. However, Color Doppler easily distinguishes between the two (see Doppler images above). Studies show some direct correlation between the size and number of free floating particles and levels of Maternal serum alpha feto-protein (MSAFP). These particles are presumed to be the result of vernix caseosa shed from the fetal skin. However, free floating particles may be visualized on ultrasound imaging even during the 2nd trimester (when vernix is not present).

Breast Biopsy Spirotome procedure under Ultrasound Guidance

2011-04-07T17:21:00.000-07:00

Macrobiopsy of breast lesions is a complicated procedure when performed with vacuum assisted biopsy tools. The Spirotome is a hand-held needle set that doesn’t need capital investment, is ready to use and provides tissue samples of high quality in substantial amounts. In this way quantitative molecular biology is possible with one tissue sample. The Coramate is an automated version of this direct and frontal technology.