Dermaimaging

In a 31-year-old man, on the trunk

What to see at dermoscopy

-Globular pattern
-Comma blood vessels
-Terminal hair
Dermoscopy in favor of dermal nevus

In a 56-year-old woman, on the perilabial area

What to see at dermoscopy:

-globular pattern
-overall architecture is symmetric
-telangectasia, comma and arborizing blood vessels
-terminal hair
Biopsy was indicated
Histopathological correlation: dermal nevus

Comments: although the dermoscopic features strongly suggest a dermal nevus, the differential diagnosis of arborizing blood vessels includes basal cell carcinoma. Collision tumours in the same biopsy specimen is not uncommon and is often reported in the literature. The most common association is basal cell carcinoma and melanocytic nevus.

For more information: Boyd AS et al: Cutaneous CollisionTumors. An analysis of 69 cases and review of the literature. Am J Dermatopatol 1994; 16: 253-257 and De Giorgi V et al. : Cutaneous collision tumor (melanocytic naevus, basal cell carcinoma, seborrhoeic keratosis): a clinica, dermoscopic and pathological case report. Br J Dermatol 2005; 152: 787-790

In a 32-year-old woman with atypical mole syndrome, on the thigh

What to see at dermoscopy:

-reticular pattern
-irregularly distributed dots
-irregular hypopigmentation
-structureless areas
-target-like structures
-comma blood vessels
Excision was indicated
Histopathological correlation: mild dysplastic nevus

In a 44-year-old woman, on the arm

What to see at dermoscopy:

-irregular globular pattern
-hypopigmented areas
-terminal hairs
-comma blood vessels and erythema at periphery
-perifollicular hypopigmentation
-structureless central area
Excision was indicated.
Histopathological correlation: congenital nevus

In a 33-year-old man, on the chest

What to see at dermoscopy:

-round lesion
-slight pigmented globular pattern
-eccentric hyperpigmentation
-telangectasia
Excision was indicated.
Histopathological correlation: dermal nevus