Wednesday, September 29, 2010

Thickened colon:












                                                                           This ultrasound image shows grossly thickened wall of the large bowel (colon) in long section. The colonic wall thickness is a massive 1.1 cms. The anechoic line within the bowel represents the lumen. Note the diffuse increase in large bowel wall thickness, suggesting large area of involvement.                                                                          













                                                                                  And the above Power Doppler ultrasound image of the same area shows hyperemia in addition. Clearly, this patient has a chronic inflammatory bowel pathology. The differentials in this case include- ulcerative colitis, Chrohn disease and also acute conditions like infective enteritis/ colitis. This patient had h/o diarrhea and bleeding per rectum with passage of mucus and pus. The clinical history, favors an infective etiology. A barium enema would be helpful as also colonoscopy. (ultrasound images are courtesy of Dr. Vikas Shukla, MD, India).
 See: http://www.ultrasound-images.com/colon.htm for more images and description. on this topic.

Monday, September 20, 2010

Abdominal aorta and its main branches- Color Doppler video:

video                                                                              The above color Doppler ultrasound video clip shows the normal upper part of the abdominal aorta withe 1st branch in the abdomen- the celiac artery, pointing almost perpendicularly from the anterior surface of the aorta. The aortic branch just below is the superior mesenteric artery, descending downwards.
  video                                                                                    The above Doppler video shows the celiac artery with the 2 main branches of this vessel- the branch heading towards the right being the common hepatic artery and the artery heading leftwards being the splenic artery. For more images and details on this topic visit: http://www.ultrasound-images.com/vascular.htm

Saturday, September 18, 2010

Gall bladder calculi- Ultrasound video clips:

video                                                                              
This patient has multiple small calculi (each of 3 to 4 mm.) in the gall bladder. She tried various conservative remedies, despite which there has been no success.
For more on this topic visit: http://www.ultrasound-images.com/gall-bladder.htm  

Case-2: showing motion of calculi within distended Gall bladder:
Ultrasound image shows one calculus in the gall bladder, in the dependent part, close to the neck. Not sure about the number of gall bladder stones....So what do we do?

Ultrasound video clip shows what looked like a single stone in the gall bladder are in fact two separate and relatively large calculi. Observe the motion of the two gall bladder stones floating from the neck to fundus as patient turns from supine to left lateral posture.

video

And later, as the patient turns to the supine position from the left lateral posture, the stones are seen moving from the fundus to GB neck.

video
Conclusion: postural change can help visualize hidden gall bladder calculi.

Case-3: large gallbladder calculus:
Ultrasound image shows a large calculus (1.5 cms.) near the neck of gallbladder. Two questions arise here: is this a solitary calculus and is this a sludge ball or a calculus?  

video
Ultrasound video clip above shows this is a single large calculus (seen moving from fundus of gallbladder to the neck, as patient rotates). Also not the strong acoustic shadow of the calculus, ruling out a biliary sludge ball.
And this video shows this whopper of a GB calculus dancing all the way from the neck of gall bladder to the fundus:

video
Another case of fine gall bladder calculi and biliary sludge in a 5 year old child:
 It is pretty difficult to say clearly if those fine echoes in the gall bladder are sludge or calculi. Perhaps it is a mixture of both.
video   


I posted another ultrasound video clip of this case via you tube. The difference in the imaging quality is striking.













The ultrasound image above shows distended gall bladder with abundant echoes within it (same case).

Thursday, September 16, 2010

Ultrasound study of Sebaceous cyst:















This patient had a large cystic mass on the anterior abdominal wall. Sonography of the lesion showed a hypoechoic, inhomogenous mass with no flow on color Doppler imaging. The above ultrasound images show the "mass" suggestive of a jelly like material within the lesion; these appearances are diagnostic of sebaecous cyst (epidermoid cyst). The neck or outlet of the sebaceous cyst is also visible in these ultrasound images. Obstruction of the outlet near the neck of the cyst due to dirt or keratinous material is the cause of the obstruction and formation of the epidermoid cyst. (These ultrasound images are courtesy of Mr. Shlomo Gobi, Israel.)
References: http://www.ultrasound-images.com/musculoskeletal.htm (free ultrasound images/ case study of epidermoid cysts). 

Wednesday, September 15, 2010

Normal anatomy of fetal heart- color Doppler ultrasound:

video This color Doppler ultrasound video clip of the normal fetal heart, shows the flow across the foramen ovale, from the right atrium to the left atrium (seen in red). RA= right atrium, LA= left atrium, LV= left ventricle, RV= right ventricle. This was a normal 3rd trimester fetus.                                                                  

video This B-mode ultrasound video clip shows the fetal heart in a 4 chamber view, with the the foramen ovale in the interatrial septum. Note the valve of the foramen ovale bulging into the left atrium as blood gushes from the fetal right atrium to left atrium. As pressure builds in the left atrium, after birth, the valve leaflet of the foramen ovale presses against the foramen, and closes this opening.
Another video clip of the normal mobility of the fetal foramen ovale valve (see below). The arrow heads point to the foramen ovale valve.
video                                                                                      
For more images and material on normal fetal heart, and cardiac anomalies visit:

Monday, September 13, 2010

Ultrasound and Doppler videos of normal fetus:

Ultrasound video clips of fetal movement in 9 week old fetus (first trimester):
To the layman, or the expectant mother the fetus begins to move when she actually feels the fetus kicking or punching within her womb. This is at about 22 to 26 weeks onwards. But the sonologist can detect fetal movement much earlier. In fact movements of the fetus begin in the early part of pregnancy (as early as 6 weeks) when the fetus actually stretches its back and neck.
 This ultrasound video clip shows fetal movement in a 9 week old fetus:

video
This sonographic video clip shows the early limb buds actually moving (the limbs are not yet developed fully and hence the term limb buds).
Another ultrasound video clip of the same fetus (9weeks)- observe the sharp movements as the fetus kicks and wriggles:
video 

Ultrasound video -Fetus at 13 weeks:
     

The ultrasound clip below shows the fetal legs (13 week old fetus):

    
Fetal spine at 13 weeks:
The video clip below shows long section of the fetal spine (13 weeks)- the spinal cord is barely visible within the bony canal. The resemblance to fish bone is striking at this age.

video
Fetal head at 13 weeks:
This video clip shows a transverse section of the fetal head with the main feature being the large whitish "masses" (lumps) within the fetal cranium- these are the choroid plexuses within the brain. This is a normal appearance and should not be mistaken for a fetal anomaly.
video

Fetal hand at 13 weeks:
It is difficult to capture the flicking, fleeting movements of the fetal limbs, at this young fetal age. But this ultrasound video shows the fetal hand with a glimpse of the fingers.
video 
Umbilical cord at 13 weeks pregnancy:
The umbilical cord can be seen easily at very early stages of pregnancy. This color Doppler video clip shows the normal umbilical cord with the twisted umbilical arteries and veins seen well. Note the pulsations of the vessels within the cord.
video

Fetus at 16 weeks: (ultrasound video clips):
Fetal hands (open) with movement:
video 
Even at this early stage of fetal development, the 16 week old fetus shows the well developed fingers, with the phalanges (bones of the digits) and the metacarpals (hand bones) seen as (hyperechoic) white lines.
And now the normal fetal head and brain at 16 weeks:
At 16 weeks, the fetal calvarium (head) is largely filled by the choroid plexus (the large whitish masses- arrowed), with the cerebrum (large brain forming a thin hypoechoic/ dark area around it). The choroid plexus is a vascular tissue that secretes fluid (the cerebro -spinal fluid) that bathes the brain and spinal cord and fills the cavity within the brain (the cerebral ventricles).
video
And now we see this ultrasound video clip of the fetal spine (16 weeks):

video 
At this early age, the spine has the characteristic fish bone appearance. The early spinal cord occupies the spinal canal (seen as those long thin whitish- (echogenic) lines within the spinal canal.
And lastly, this coronal section (parallel to the face) video clip shows the fetal face with the eyes and mouth. Observe closely- the fetal mouth is seen opening and closing:
video 
Fetal anatomy at 23 weeks:

video
Both fetal hands with the fingers are seen near the head in this fetal ultrasound video.






Fetal anatomy in 3rd trimester (last 3 months of gestation):

video Here is a nice ultrasound video clip of fetus in the process of yawning. Observe how the lips open during the fetal yawn. This was a 3rd trimester (32 week old fetus).
Another ultrasound video of a third trimester (more than 24 weeks) fetus in the process of swallowing amniotic fluid. The fetal tongue, lips and nose are seen in profile (side view) in this sagittal section:
  video
  video This sonographic video clip shows the fetal upper limb, including the elbow and the clenched fetal hand.
  video And this video of the fetal lower limb from the thigh to the foot. Observe the fetus attempting to "kick" the walls of the uterus.
From the external anatomy of the fetus to more serious study- the fetal arch of the aorta is seen originating from the left ventricle outflow tract and extending down to traverse the fetal thorax and abdomen as it becomes the fetal descending aorta, in these color Doppler ultrasound video clips (22 week old fetus). Arrows point to the fetal descending aorta:                                                                                                     

video There is some loss of quality of the uploaded ultrasound / color Doppler video video clips on this blog (I think that is the result of the conversion from mpg files to the flash player format on this blog). Those wishing to obtain the original videos in .mpg format can contact me at drjoea (at) gmail.com
video
Here is another color Doppler video of the fetal aorta. I believe one can see the fetal ductus arteriosus emerging from the inferior aspect of the arch of the aorta in these clips. For more images and discussion of normal fetal anatomy, visit: http://www.ultrasound-images.com/fetus-general.htm and
http://www.ultrasound-images.com/fetal-chest.htm     
Fetal spinal cord (35 weeks gestational age):
Here are some still images showing the spinal cord of a fetus at 35 weeks gestational age:
I first captured this image showing the thoraco-lumbar region of the spinal cord with a convex 4 Mhz probe.

Then, I repeated the scan with a 9 Mhz probe. The tapered filum terminale and terminal part (conus medullaris) of the cord are seen in this ultrasound image (below):

 













The spinal cord (arrows) is the hypoechoic tubular structure between those 2 echogenic (bright) membranes (the dura mater) within the spinal canal.













                         
Reference: http://www.ajronline.org/cgi/reprint/164/2/421
http://www.jultrasoundmed.org/cgi/reprint/25/11/1397.pdf

Fetal ear (35 weeks gestational age):
This ultrasound image shows the fetal external ear with the external auditory canal (arrows):














These ultrasound video clips show the pinna of the fetal ear with the anechoic external auditory canal (external auditory meatus) reaching deep into the fetal skull.
video 

The same part of the fetal ear seen with arrows pointing to the fetal external auditory canal (meatus) (the part of the external ear). The external auditory canal (meatus) is the part of the ear that extends from the pinna to the middle ear, (the part of the ear that can be seen).

video

Saturday, September 11, 2010

Color Doppler ultrasound video clips of varicocele















This case of recurrence of varicocele of the left scrotum; color Doppler ultrasound image shows a grade 3 varicocele of the left side. The pampiniform veins of the left side measure almost 4.4 mm on valsalva maneuver.



                                                                     
                                                                                  The right scrotum is also affected and show a grade 3 varicocele affecting a few vessels. Recurrence of varicocele after surgical correction is a known sequel of surgery.
video This color Doppler video clip shows multiple veins dilating and filling up on Valsalva maneuver. The left of the video shows the appearance at rest in the left scrotum. 
  video                                                                             Same case: another video demonstrating the effect of breath holding for a few seconds. Note that the diameter of the veins (left scrotum) almost doubles on valsalva maneuver.
See: http://www.ultrasound-images.com/scrotum.htm for more on this topic 
CASE-2: Grade -3 varicocele (bilateral) with severe reflux:
Color Doppler ultrasound video of Left scrotal varicocele:

video                                                                                
The right scrotum also showed grade 3 varicocele:                                                                                          
video                                                                                     
The left half of the video clip shows the pampiniform veins at rest. The right half shows the pampiniform veins filling up during Valsalva maneuver. This patient has markedly low sperm count and poor motility of the sperms visualized on semen examination. Surgery may be the only method to improve his fertility and chances of having a child.
The above color Doppler image of the right scrotum shows the veins measuring 4.2 mm. in the right scrotum!!  
                                                                                                                                                                        
 The left scrotum showed veins measuring as high as 5.7 mm. on Valsalva maneuver (see color Doppler ultrasound image above).
                                                                                                                                           
Visit: http://www.ultrasound-images.com/scrotum.htm for more on this topic.