00:02
Let’s shift gears a little bit and talk
about another type of presentation.
00:06
Here’s a five-year-old girl who’s
coming into the emergency department
with bloody and occasionally
melanotic stools.
00:12
Lab works shows that she’s got a little
bit of an iron deficiency anemia.
00:17
She denies pain.
00:19
And according to mom, other
than strange stools,
she’s been relatively asymptomatic.
00:26
We like to think of the
appendix as an outpouching
of intestinal material
around the cecum.
00:33
And in this case, this is
another one that happens
in only a smaller percentage
of the population.
00:38
So this is going to be a
Meckel’s diverticulum.
00:44
The Meckel’s diverticulum is a failed
involution of the vitelline duct.
00:50
As you can see on the slide here,
it’s generally an outpouching, a
diverticulum, of the intestine
that’s heading up
towards the umbilicus.
01:01
This is the most common true
diverticulum in humans.
01:05
And it’s the common congenital
malformation of the GI tract.
01:13
So an important rule to
remember is the rule of twos.
01:17
This is highly likely to show
up on a multiple choice exam.
01:23
So Meckel’s diverticulums occur
in 2% of the population.
01:29
They are two times as common in
males than they are as females.
01:34
They are generally 2 inches long.
01:37
They generally occur 2 feet
before the ileocecal valve.
01:43
And so if you can remember
those rules of twos,
you’ll be in good shape on the
exam that you’re going to take.
01:50
Generally, these patients will present
with bleeding from their Meckel’s
and we’ll talk about
why in a second.
01:56
But you’ll see that they’ll
have melanotic or black stools.
02:00
They may have bloody
stools or rectal bleeding.
02:04
But in general, they’ll be asymptomatic,
they won’t have pain from this.
02:08
It will just be a brisk GI bleed.
02:12
Occasionally, they can
develop bowel obstruction
and occasionally, they may
get some anemia as well.
02:19
Generally, it’s a slow bleed.
02:21
So they may have an iron
deficiency anemia from
simply not replacing
their body iron stores
as they’re making new blood
to replace the old blood.
02:31
The bowel obstruction may be from
something called an intussusception
and we’ll learn about that in
another talk but keep that in mind.
02:41
The way we test for a Meckel’s diverticulum
is by using a radionucleotide scan,
a technetium-99m
pertechnetate scan.
02:53
And we’re going to look for
gastric mucosa that is
outside the stomach.
03:00
So you can see here that mucus cells
have taken up the pertechnetate
and they’ve done it as where
the arrow shows on this slide
at the level of a Meckel’s,
which is outside the stomach,
which is the large dark blob that
you can see at the top of the slide.
03:19
70% of cases of a Meckel’s
will be found this way.
03:25
But that means that 30% of
cases of Meckel’s will not.
03:30
So if we suspected a
Meckel’s that will not,
we’ll look for other imaging
modalities like ultrasound,
MRI, and CAT scan like we
did in the appendicitis.
03:41
How do we treat a Meckel’s?
Simply just like we did in appendicitis,
this requires a surgical excision.
03:51
So in summary, those are two
common problems in children
which are outpouchings or
diverticuli of the intestinal wall
that can cause problems in children.
04:03
Meckel’s is a painless bleed whereas the
appendicitis is an acute infection.
04:08
Thanks for your attention.