Transcript
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CASE STUDIES IN DERMATOLOGIC PATTERN

RECOGNITIONPart 1

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PATTERN RECOGNITION IS THE CAPACITY TO DESCRIBE A RASH OR LESION USING A VARIETY OF PHYSICAL CHACTERISTICS IN ORDER

TO LIMIT THE DIFFERENTIAL DIAGNOSIS

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PHYSICAL CHARACTERISTICS OF ALL

RASHES AND LESIONS

• 1.BASIC MORPHOLOGY

• 2.SIZE

• 3.SHAPE

• 4.COLOR

• 5.PATTERN

• 6.DISTRIBUTION

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EXAMLPES OF BASIC MORPHOLOGY

• 1.MACULE AND PATCH

• 2.PAPULE AND NODULE

• 3.PUSTULE

• 4.WHEAL

• 5.VESICLE AND BULLA

• 6.PLAQUE

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MACULES AND PATCHES

MACULES ARE FLAT AND THEREFORE NOT RECOGNIZED

BY TOUCH BUT RATHER A CHANGE IN COLOR FROM YHE SURROUNDING SKIN. PATCHES

ARE LARGER MACULES

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MONGOLIAN SPOTS

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PAPULES AND NODULES

PAPULES ARE ELEVATED SOLID LESIONS UP TO.5 CM IN

DIAMETER. NODULES ARE LARGER THAN PAPULES

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NEUROFIBROMA

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PUSTULES

PUSTULES ARE EPIDERMAL OR UPPER DERMAL COLLECTIONS

OF PUS. ABSCESSES ARE DEEPER PUSTULES

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BULLOUS IMPETGO

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ABSCESSES

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WHEALS

WHEALS ARE ROUNDED PALE RED PAPULES OR PLAQUES

CAUSED BY THE EXTRAVASATION OF FLUID

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URTICARIA

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VESICLES AND BULLAE

VESICLES ARE LESIONS FORMED BY FLUID CREATING A

CLEAVAGE PLANE BENEATH THE STRATUM CORNEUM.

BULLAE ARE LARGER VESICLES

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IMPETIGO

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PLAQUES

PLAQUES ARE RAISED LESIONS WITH A FLAT TOP. THE RISE IN

ELEVATION IS MUCH LESS THAN YHR WIDTH OF THE

LESION

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PSORIASIS

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EXAMLPLES OF LESION SHAPE

• 1.ANNULAR.. Like a ring• 2.NUMMULAR… like a coin• 3.LINEAR• 4.OVAL• 5.TARGET• 6.SERPIGENOUS• 7.RETICULATE .. Forming a network• 8.STELLATE …star like

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ANNULAR

ANNULAR LESIONS ARE CIRCULAR AND HAVE A

CENTER WITH AN APPEARANCE DIFFERENT FROM THEIR

EDGE OR BORDER

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KERATOACANTHOMA

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NUMMULAR

NUMMULAR LESIONS TAKE ON THE APPEARANCE OF A FILLED

CIRCLE OR COIN

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NUMMULAR ECZEMA

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LINEAR

LINEAR LESIONS ARE LONG RELATIVE TO THEIR WIDTH AND GENERALLY STRAIGHT

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KELOID

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OVAL

THE WORD IS SELF EXPLANATORY

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FIXED DRUG ERUPTION

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TARGET

TARGET LESIONS ARE MADE UP OF CONCENTRIC CIRCLES OF WHITE AND RED FORMING A

BULLSEYE APPEARANCE

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ERYTHEMA MULTIFORME

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SERPIGENOUS

LESIONS THAT ARE LONG AND WAVEY WITH A SNAKE-LIKE

APPEARANCE

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LARVA MIGRANS

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RETICULATE

LESIONS WITH AN INTERCONNECTED OR LACE-

LIKE APPEARANCE

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STRETCH MARKS

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STELLATE

LESIONS WITH A STAR-LIKE APPEARANCE USUALLY FROM

A RADIAL SPREAD FROM A CENTRAL FOCUS

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SUPERFICIAL VARICOSITIES

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EXAMPLES OF LESION PATTERN

• 1.GROUPED

• 2.DISSEMINATED

• 3.DERMATOMAL

• 4.SYMMETRIC

• 5.PHOTOSENSITIVE

• 6. CONFLUENT

• 7.INTERTRIGENOUS

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GROUPED

MULTIPLE SIMILAR LESIONS ORGANIZED IN CLOSE

PROXIMITY

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GENITAL WARTS

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DISSEMINATED

LESIONS WHICH ARE SCATTERED RANDOMLY OVER

ALL OR MOST OF THE BODY

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GENERALIZED DRUG

REACTION

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DERMATOMAL

LESIONS THAT FOLLOW THE PATH OF A PERIPHERAL

SENSORY NERVE

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HERPES ZOSTER

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SYMMETRIC

LESIONS THAT ARE MIRROR IMAGES OF EACHOTHER FROM ONE SIDE OF THE BODY TO THE

OTHER

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ONYCHOMYCOSIS

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PHOTOSENSITIVE

LESIONS LIMITED TO THE SUN EXPOSED PARTS OF THE BODY

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PHOTOSENSITIVE DRUG ERUPTION

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CONFLUENT

THE PROCESS OF SMALLER LESIONS COMING TOGETHER UNTIL THEY FORM A LARGE

LESION BY MERGING

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TINEA CORPORIS

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INTERTRIGENOUS

LESIONS THAT ARE LOCATED BETWEEN SKIN FOLDS SUCH AS

THE AXILLA, GROIN OR BETWEEN FINGERS OR TOES

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LESION SIZE

• USUALLY DESCRIBED IN MILLIMETERS OR CENTIMETERS

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EXAMPLES OF LESION OR RASH COLOR

• 1.HYOPIGMENTED• 2.HYPERPIGMENTED• 3.WHITE• 4.BLACK• 5.BLUE• 6.YELLOW• 7.VIOLACEOUS• 8.VARIEGATED

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EXAMPLES OF LESION DISTRIBUTION

• 1.HEAD• 2.ORAL• 3.AXILLARY• 4.TRUNCAL• 5.ANOGENITAL• 6.INGUINAL• 7.DEPENDENT• 8.PEDAL


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