Clincal: Melanocytic Tumors Flashcards Preview

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Flashcards in Clincal: Melanocytic Tumors Deck (19):
1

What evaluation should be done in patients with large congenital nevi with satellite lesions?

Order an MRI
-these patients are at risk of cranial or leptomeningial melanocytosis (melanocytic tumors in the arachnoid and pia mater)

-remember melanocytes form from neural crest cells, so it is possible that some melanocytes formed in the CNS

2

What are benign acquired nevi?

Moles
-usually one color, symmetric, small

3

What are dysplastic nevi?

Moles with some clinically atypical features (shape, color, borders)

4

What is a Spitz Nevus?

Melanocytic lesion that usually occurs in kids. Histology is similar to melanoma

5

Gross morphology of melanoma

Tumor of melanocytes with asymmetrical shape, irregular borders, multiple colors, larger 6mm diameter, rapidly evolving

6

How is melanoma differentiated from dysplastic nevi?

Pathological biopsy
-grossly they look the same
-a dysplastic nevus NEVER turns into a melanoma however a melanoma can arise from tissue among or in close proximity to a nevus

7

Most common subtype of melanomas

Superficial Spreading Melanoma
-slowly spreading and changing lesion over years

8

Most aggressive subtype of melanoma

Nodular Melanoma
-rapidly evolving black or blue-red uniform nodule

9

What is Lentigo Maligna?

Melanoma due to chronic sun exposure
-usually starts as macular or patchy (flat) hyperpigmented growth

10

What is Acral Lentiginous Melanoma?

Melanoma on the hands and feet
-most common in African, African American, Asian descent
-poor prognosis because diagnosis is usually delayed

11

What is Amelanotic Melanoma?

Melanoma without pigment, so it looks more like basal cell or squamous cell carcinoma

12

Gold standard for melanoma diagnosis

Histopathology

13

Why do skin biopsies suspected of being melanoma need to be removed all the way down to the subQ fat layer?

Depth of the primary lesion determines staging and prognosis (Breslow Thickness)

14

What is a sentinel lymph node biopsy

Method of using irradiated dye to follow lymphatic flow of a suspicious lesion to the nearest lymph node. Useful if lymph nodes need to be removed.

15

Treatment for melanoma

Complete lesional excision and lymph node dissection if necessary

16

3 most common sites for melanoma metastasis

Lungs
Liver
Brain

17

MOA of Vemurafinib

Treatment for melanoma
-inhibits an enzyme called B-RAF in the cellular mitotic pathway
-in order for the medication to target this enzyme it must have a mutation, this mutation is very common in melanomas

18

MOA of Trametinib

MEK inhibitor that arrests the mitotic pathway

19

MOA of Dabrafenib

B-RAF inhibitor that arrests the mitotic pathway