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Plastic Surgery( Grabb)Ali jasim > Congenital Melanocytic Nevi and Other Common Skin Lesions > Flashcards

Congenital Melanocytic Nevi and Other Common Skin Lesions Flashcards

1
Q

The malignant potential of melanocytic nevi depends largely upon cell type

A

The malignant potential of melanocytic nevi depends largely upon size,

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2
Q

Acquired nevi are often located at the junction of the epidermis and dermis,

A

T

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3
Q

dermal nevi have no malignant potential but typically protrude above the surface of the skin as flesh-colored papules

A

F. dermal nevi have low malignant potential but typically protrude above the surface of the skin as flesh-colored papules

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4
Q

having congenital features follow hair follicles through the dermis and into the superficial subcutaneous tissues

A

T

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5
Q

Giant of the face should be bigger than 20 cm

A

A large part of the face and scalp may be classified as a giant hairy nevus, even if the exact measurement is less than 20 cm

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6
Q

Mongolian spots are found on the lumbosacral area , disappear in all patients by 3 to 5 years of age and in the remainder by puberty

A

Mongolian spots are found on the lumbosacral area and are characterized by dermal melanocytic pigmentation, but curiously disappear in most patients by 3 to 5 years of age and in the remainder by puberty

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7
Q

What the most important prognostic indicater for melanoma

A

Tumor thickness, the most important prognostic indicator

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8
Q

the least important feature of melanoma id diameter

A

T

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9
Q

Neurocutanous melanosis occures with any congenital nevi, T or F

A

F. Neurocutanous melanosis occures with large (>20 cm) congenital nevi, or with multiple nevi in association with meningeal melanosis or melanoma

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10
Q

Partial-thickness removal appears to be more effective if it is performed before the nevus becomes verrucous as the cleavage plane between the epidermis and dermis appears to separate more uniformly.

A

T

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11
Q

Epidermal nevus recurrence is les common

A

F. Common

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12
Q

After settling of the infected epidermal cyst can easily separate the capsule T. Or. F

A

F. whereas previously inflamed or recurrent cysts often have dense adhesions to the surrounding fat.

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13
Q

The origins of Pilomatrixomas is specious gland

A

F. Hair cell

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14
Q

The role of lasers may be useful for epidermal nevi, but it remains controversial for melanocytic nevi.

A

T

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15
Q

No subcutaneous in eyelid

A

T

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16
Q

ablative techniques that penetrate into the papillary dermis can cause undesirable scar formation.

A

F. ablative techniques that penetrate into the reticular dermis can cause undesirable scar formation.

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17
Q

Nevi that are located in both layers are junctional nevi.

A

F. Nevi that are located in both layers are compound nevi.

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18
Q

The most I curate classification of congenital nevus is the size. T. Or F

A

F. Congenital nevi are most accurately classified by their microscopic appearance

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19
Q

The most common site for spits nevus are the trunk t or f

A

F. Face and neck no mor than 1 cm

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20
Q

Biobsy is always indicated in halo nevus. ?

A

F. but biopsy is indicated if the central nevus appears atypical.

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21
Q

Halonevus most commonly occures in early. adolescent F or T

A

F. A nevus with a surrounding zone of hyp opigmented skin occurs most commonly in late adolescence

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22
Q

The most common location is on the face

A

F. The most common location is on the trunk, especially the back

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23
Q

patients with many dysplastic nevi and two or more first-degree relatives with melanoma have perhaps a lifetime risk of melanoma approaching 50%

A

F. patients with many dysplastic nevi and two or more first-degree relatives with melanoma have perhaps a lifetime risk of melanoma approaching 100%

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24
Q

The malignant potential for most melanocytic nevi is less than 1%

A

T

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25
Q

Neurocutaneous melanosis occures only if the size of melanoma mor than 20 cm. T or. F

A

F. It can be associated
with large (>20 cm) congenital nevi, or with multiple nevi in association with meningeal melanosis or melanoma.

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26
Q

Wich nevu look like wart

A

Epidermal nevus

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27
Q

The most common site of Sebaceous Nevi is trunk

A

F often located on the scalp and face

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28
Q

Dermoid cysts can occur in the head only

A

F. Dermoid cysts can occur anywhere along sites of embryologic fusion,

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29
Q

Small and medium-sized melanocytic nevi have a lifetime
risk of melanoma of less than 1%.

A

T

30
Q

Giant congenital nevi
may have a lifetime risk of 5% to 10%

A

T

31
Q

Epidermal nevi have low malignant potential but become increasingly verrucous over time, posing significant cosmetic concerns

A

F Epidermal nevi have no malignant potential but become increasingly verrucous over time, posing significant cosmetic concerns

32
Q

Nevi that are characterized as having congenital features follow hair follicles through the dermis and into the superficial subcutaneous tissues

A

T

33
Q

Congenital nevi are also classified by their size

A

1.5 cm, 1.5 to 20 cm, and greater than 20 cm

34
Q

Nevi greater than 50 cm in dimension are very rare,
occurring in 1:500,000 births

A

T

35
Q

Nevus of Ota is a
dermal melanocytic nevus located on the face (Vl and V2 distribution), which occurs more commonly in women,

A

T

36
Q

Nevus of OTA common in Caucasians

A

F rarely in Caucasians

37
Q

nevus
of Ito is characterized by dermal melanocytosis, except that its location is on the shoulder, upper chest, and back

A

T

38
Q

congenital nevi have melanocytic pigment throughout all layers of the skin.

A

T

39
Q

Spitz nevi resemble melanomas and carry the same oncologic
risk

A

F Spitz nevi resemble melanomas but do not carry the same oncologic
risk

40
Q

Spitz nevus most commonly occurs in the trunk

A

F They occur most commonly on the face and neck between the ages of 3 and 13,

41
Q

Spitz nevus are usually less than I cm in diameter, and have a well-circumscribed border

A

T

42
Q

Spitz nevus may exhibit rapid growth,

A

T

43
Q

Excision with a small margin of normal skin is sufficient sufficient for spitz nevus

A

T

44
Q

pigment may returned in halo nevus

A

T

45
Q

Biopsy always indicated in halo nevus

A

F biopsy
is indicated if the central nevus appears atypical

46
Q

The most common location is on the trunk, especially the back, and patients may have more than one such lesion in halo nevus

A

T

47
Q

Patients with large numbers of dysplastic nevi are best followed with full body photographs to help determine which nevi are truly changing and deserve biopsy.

A

T

48
Q

The ABCDEs of suspicious nevi include asymmetry, irregular border, variegation in color, diameter larger than a pencil eraser (>6 mm, probably the least important feature), and most importantly a changing nevus (evolution)

A

T

49
Q

If a melanoma is diagnosed, a wide local excision is indicated down to the muscle fascia,

A

T

50
Q

Indication for lymph node staging ,node dissection in melnoma ,

A

the thickness and depth of the melanoma, mitosis
per square mm, presence of tumor-infiltrating lymphocytes, presence or absence of regression, and other features such as tumor ulceration, tumor satellitosis, and neurotropism may dictate the need for sentinel lymph node staging, node dissection, metastatic screening, and
periodic follow-up.

51
Q

in cosmetically challenging areas such as the eyelid where surgical options for nevi usually result in poor results we can use laser for the melanoma in these sites

A

T

52
Q

Neurocutaneous melanosis is a rare condition thought to arise from abnormal development of the neuroectoderm that results in melanotic tissue in both the skin and meninges

A

T

53
Q

A screening MRI
can be done at 4 to 6 months for diagnosis of neurocutaneous melanosis

A

T

54
Q

the prognosis is poor, even in the absence of meningeal melanoma, as patients may exhibit hydrocephalus, seizures, developmental delay, cranial nerve palsies, and a tethered spinal cord

A

T

55
Q

Epidermal nevus can resample wart

A

T

56
Q

What is the epidermal nevus syndrome?

A

extracutaneous manifestation of epidermal nevus
Cataracts, colobomas, seizures, developmental delay, hemiparesis, scoliosis, growth abnormalities of the extremities, and vitamin D-resistant rickets

57
Q

Treatment of epidermal nevus ?

A

includes tangential shave excision (scalpel or iris scissors), dermabrasion, CO
2 laser vaporization or surgical removal

58
Q

Partial-thickness removal appears to be more effective if it is
performed before the nevus becomes verrucous as the cleavage plane between the epidermis and dermis appears to separate more uniformly

A

T

59
Q

reccurnace is uncommon with epidermal nevus

A

F common

60
Q

Sebaceous Nevi when located on the scalp they are non-hair bearing

A

T

61
Q

When these nevi occur on the face, conservative observation, tangential shave excision, and CO2 laser vaporization may be
chosen

A

T

62
Q

epidermal previously inflamed or recurrent cysts often have dense adhesions to the
surrounding fat

A

T

63
Q

Pilomatrixomas com from the pilosebaceous tissue

A

F benign tumor of hair
cell origin

64
Q

clinically appears similar to an epidermal
cyst, but with a rock-hard texture

A

T

65
Q

They are usually adherent to the
overlying skin, and sometimes may be mistaken for a vascular malformation as the overlying skin may contain a bluish hue and small
telangiectasias, which resolve after excision

A

T

66
Q

The capsule is thin and
fragile, and clusters of calcified granules are easily visualized through it. Complete excision with a small amount of adherent overlying skin is curative

A

T

67
Q

Intracranial extension can occur with midline nasal,
glabellar, and temporal dermoids; therefore, dermoids in these locations are best worked up with MRI or CT scans

A

T

68
Q

Lateral brow dermoids are best approached through lateral
supratarsal fold incisions that leave an imperceptible scar rather than
through the eyebrow

A

T

69
Q

They are commonly adherent
to the periosteum and may even cause bony indentations that resolve after cyst removal.

A

T

70
Q

Pathologists note that
complete excision can be difficult to confirm because the margins can be challenging to interpret since normal skin contains
sebaceous glands in sebaceous nevi

A

T

71
Q

. Dermoid cysts develop during pregnancy and can
occur anywhere along sites of embryologic fusion

A

T

Plastic Surgery( Grabb)Ali jasim (92 decks)

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