siascope training course example lesions training lesions this course trains you in identifying...

SIAscope Training Course

Example lesions

Training lesions

• This course trains you in identifying SIAgraph features, as well as linking them with ELM (dermoscopy) diagnosis.

• Answer the questions on the different kinds of lesions in the following slides.

• Use the evidence in the features to make a diagnosis.

Feature checklist

• The three features which research has identified as the most useful in melanoma diagnosis are as follows:– Dermal melanin– Displaced blood with erythematous blush– Holes in collagen

• These features will now be defined.

Dermal Melanin

• Shown on the SIA-DM (dermal melanin) SIAgraph

• Areas of colour (green – blue – red)• Goes from least (green) to most (red)

involvement (combination of depth + concentration)

• A contiguous area of dermal melanin within the lesion– NB excluding hairs.

Displaced blood

• Shown on the SIA-B (blood) SIAgraph

• A contigious absence of blood within the lesion

• Area of white

Erythematous blush

• Shown on the SIA-B (blood) SIAgraph

• Increased vascularity around the periphery of the lesion for at least ¾ of its circumference (when compared to surrounding skin, within confines of lesion.)

• Seen as darker red area within a lesion

Holes in Collagen

• Shown on SIA-C (collagen) SIAgraph

• A contiguous absence of collagen within the lesion but discounting hair follicles.

• Black “holes” in collagen

Example lesions

• The following slides contain SIAgraphs of different lesions, in addition to a few case notes.

• Using the definitions from the previous slide, try to decide whether or not a feature is present in a lesion.

Example lesions

• Then press one of the bottom buttons to answer the question.

• Click in the centre of the slide for an explanation of the feature.

• Turn your computer’s sound on if possible.

26_05_00_16_56

• This lesion presented on the chest of a 53 year old male.

Are collagen holes present in this lesion?

Yes No

No.

• There is no contiguous absence of collagen within the lesion. (Black areas)

Is displaced blood present in this lesion?

Yes No

No.

• There is no contigious absence of blood within the lesion. (White areas)

Is dermal melanin present in this lesion?

Yes No

No.

• There is no blue on the SIA-DM.

What is your diagnosis?

• No collagen holes

• No displaced blood

• No dermal melanin

Diagnosis

• Compound Naevus

• Remember, although they have melanocytes in the dermis, most compound naevi do not have dermal melanin.– Melanocytes have stopped producing

melanin.

19_05_00_16_47

• This lesion presented on the back of a 43 year old male.


Yes No

Yes.

• There are black areas within the body of the lesion on the SIA-C, which are not hair follicles.

• Using a SIAscope would allow you to zoom in on areas of doubt, to clarify whether or not the feature exists.


Yes No

Yes.

• There is a large white area in the centre of the lesion.

Is Erythematous blush present in this lesion?

Yes No

Yes.

• There is increased vascularity around the periphery of the lesion for at least ¾ of its circumference.

• Compared to the surrounding skin.

• This is a strong example of both displaced blood and erythematous blush.


Yes No

Yes.

• This is shown in several colours, showing that the lesion has a large dermal component.


• Holes in collagen

• Displaced blood plus erythematous blush

• Dermal melanin

Diagnosis

• Melanoma. • Clark’s level 3+

– Holes in the collagen SIAgraph show that the melanoma has penetrated to the bottom of the papillary dermis.

– The SIAscope cannot image any further than the bottom of the papillary dermis.

• As the reticular dermis does not scatter light sufficiently.

1491688_a

• An 18 year old male presented with this lesion on the back.


Yes No

No.

• Displaced blood is not present in this lesion.– WHY?

• There are no areas demonstrating an absence of blood (white).


NoYes

No.

• There are no black areas within the lesion.

• In this case, matching fluid has not been used, and the collagen view is slightly distorted.– In difficult cases, rescanning the lesion

using matching fluid may help improve the clarity of the collagen image.


Yes No

No.

• Areas of dermal melanin are shown in blue on the SIA – DM.

• Areas of blue ARE visible in a rim around the top right of the SIA-DM.– However, they are not within the lesion, and are

probably a result of light leakage when taking the handset.

• Remember to use matching fluid – – Lesions without dermal melanin can appear to

have dermal melanin if scanned without fluid

Would you excise this lesion?




Diagnosis

• Benign

• Dysplastic Naevus

728834_a

• This lesion presented on the forearm of an 84 year old female.


Yes No

No.

• There is no contiguous absence of collagen within the lesion.


Yes No

No.

• However, note that the lesion consists of blood, making the diagnosis of haemangioma most likely.


Yes No

Yes.

• Dermal melanin is shown on the SIAgraph.• However, this may be haemasiderin, a

breakdown product of blood that mimics dermal melanin on dermal melanin SIAgraph.

• If dermal melanin is shown in a haemangioma, it is normally only green in colour, and not blue or red.

Diagnosis

• Haemangioma



• Dermal melanin indicated (Haemasiderin)

05_06_00_08_59

• This lesion presented on the face of a 54 year old female.


Yes No

Yes.

• All over the lesion are large black areas – these are holes.


Yes No

Yes.

• There are large areas where there is significantly less blood than in the surrounding tissue.

Is erythematous blush present in this lesion?

Yes No

Yes.

• There is increased vascularity around the periphery of the lesion for at least ¾ of its circumference.


Yes No

Yes.

• Throughout the lesion.

• Note the blue around the edge of the lesion, caused by grease/dirt on the lens or light leakage.

• Note that for the majority of the lesion, a red colour is shown, implying a large amount of melanin in the dermis.

Would you remove this lesion?


• Displaced blood and erythematous blush

• Dermal melanin

Diagnosis

• Melanoma

• Clark’s level 3+

• Large areas of invasion with a great deal of melanin in the dermis indicate a poor prognosis in this case.

30_05_00_11_41

• This lesion presented on the lower leg of an 89 year old male.


Yes No

Yes.

• Black areas are present, although they are not as obvious as in the last case.


Yes No

Yes.

• The SIAscope handset is unable to image the entirety of this lesion.

• However, we can see increased vascularity at the periphery of the lesion for a significant proportion of the visible area.


Yes No

Yes.

• Note that there is less red colour than in the previous lesion, implying less invasion.




• Dermal melanin

Diagnosis

• Melanoma

06_06_00_11_50

• This lesion presented on the forearm of a 55 year old male.


Yes No

Yes.

• Once again, three levels are shown even though the lesion is small.




• Dermal melanin

Diagnosis

• Although this lesion is small, using the SIAgraphs gives us additional information to aid diagnosis.

• The lesion is a melanoma.

• Clark’s level 2– Melanin in the dermis but no holes in the

collagen.

670577_a

• This lesion presented on the abdomen of a 56 year old male.


Yes No

No.

• A difficult case though, as collagen is thinner in small areas inside the circle.

• These areas could be the start of holes.


Yes No

No.

• But it’s not easy to see.• This is an unusual case where disagreement is possible.• Using the “image enhance” button can help in cases like this.


Yes No

Yes.

• Although it is less pronounced than in some lesions.


Yes No

Yes.

• 3 levels.

What is you diagnosis?

• And would you remove this lesion?


• No displaced blood plus erythematous blush

• Dermal melanin

Diagnosis

• Melanoma– This is a case where there are no holes in

the collagen or displacement/blush combination.

– However, if a lesion has dermal melanin, the doctor should consider precautionary excision in any case.

– Especially if the dermal melanin is deep.

564891_b



Yes No

No.

• The collagen within the lesion is very smooth.


Yes No

No.

• There is very little change in vascularity within the lesion, implying that the lesion is largely epidermal in nature.


Yes No

Diagnosis

• Seborrhoeic Keratosis

749590_a

• This lesion presented on the shoulder of a 13 year old female.


Yes No

No.

• There are areas of white in the blood SIAgraph of the lesion, but these are not contiguous.

• This is a very difficult example.


Yes No


• And would you excise this lesion?


• No displacement plus blush

• Dermal melanin (3 levels)

Diagnosis

• Compound Naevus– Only one of the diagnostic indicators is

present in this lesion.– Seeing compound naevi with such large

levels of dermal involvement is quite rare.– Melanoma is rare in people 13 years of

age, although the shoulder may be an area of high sun exposure.

749590_c

• This lesion presented on the shoulder of a 13 year old female.


Yes No

No.

• The lesion has an even increase in vascularity throughout.

Yes No


Diagnosis

• Junctional Naevus

• This should be an easy diagnosis.

1002256_b

• This lesion presented on the forehead of a 36 year old female.


Yes No

Yes.

• Note the areas of light leakage around the edges of this SIAgraph.

• This lesion was on the patient’s forehead, a difficult area to examine without light leakage occurring.

• Loosening the skin as much as possible around the lesion may help in cases like this.



• No displaced blood plus erythematous blush

• Dermal melanin

Diagnosis

• Intra-dermal Naevus

• Unusually, the melanocytes in the dermis are still producing melanin.

564891_a



Yes No

No.

• Note the hair, which shows up white.

• Comparison to the ELM / dermoscopy view helps to clarify this.

• The half fade button is useful when trying to match up hairs etc.

Yes No


• Would you excise this lesion?




Diagnosis

• Seborrhoeic Keratosis

16_05_00_11_29

• This lesion presented on the lower leg of a 51 year old female.


Yes No

No.

• The zoom function is useful in cases like this, where some areas within the lesion seem to have approximately the same amount of collagen as the surrounding skin.


Yes No




• Dermal melanin

Diagnosis

• Melanoma

• Small holes in the collagen make this a Clark’s 3+.

• However, as the holes are small it is unlikely that the melanoma has progressed beyond Clark’s level 3.

16_05_00_09_45

• This lesion presented on the back of a 22 year old male.


Yes No



• No displaced blood plus blush

• Dermal melanin

Diagnosis

• Melanoma– A thin melanoma, with some dermal

component.– There is a great deal of vascularity in this

lesion, and a significant amount of fibrosis.– Once again, a doctor would think hard

before sending home any lesion with dermal melanin.

A more difficult case…

• This case contains some more complicated histology, some of which may be confusing for doctors beginning to use the SIAscope.

• One example of a histological feature that may appear confusing in SIAgraphs is haemasiderin, a breakdown product of blood that mimics dermal melanin.

382263_a

• This lesion presented on the lower leg of a 63 year old male.


Yes No

Yes.

• This is an infiltrative BCC.

• Remember, to ensure proper identification of collagen holes, matching fluid must be used.

• The amount of artifact caused by each hair in this scan implies that matching fluid has not been used.


Yes No

No.

• However, note the lacunes of blood.


Yes No

No.

• As you know, sometimes haemasiderin can be detected as dermal melanin. In a lesion of this sort, sometimes dermal melanin is detected in the areas where there are lacunes of blood.

Diagnosis

• Pigmented Basal Cell Carcinoma

761817_a

• This lesion presented on the lower leg of a 16 year old male.


Yes No

Yes.

• There are collagen holes in this lesion.


Yes No

Yes.

• Displaced blood is present in this lesion.

• Note the lacunes of blood, with clearly demarcated edges, in this lesion.


Yes No

Yes.

• Increased vascularity around the periphery of the lesion for at least ¾ of its circumference (when compared to surrounding skin, within confines of lesion.)


Yes No

Yes.

• Dermal melanin is present.

Diagnosis

• Haemangioma

• The SIAscope helps more in some cases and less in others!

End of Example Lesions

• By now you should feel able to comment intelligently on the SIAgraphs of various clinical conditions including melanoma.

• Use the SIAscope (or an emulator) for more practice.

siascope training course example lesions training lesions this course trains you in identifying...

Documents

lesion slide

collagen slide

yesno slide

fluid slide

previous slide

noyes slide

lesion area of white

lesion nb