In a 50-year-old man, on the hip
What to see at dermoscopy:
-globular pattern
-terminal hairs with perifollicular hypopigmentation
-structureless areas
-erythema
-milia-like cysts
Dermoscopy in favor of dermal nevus. Regular control was suggested
In a 15-year-old woman, on the abdomen
What to see at dermoscopy:
-regular globular pattern
-irregular blue-white veil distribution
Dermoscopy in favor of dermal nevus. Regular control was suggested
In a 50-year-old man, on the thigh
What to see at dermoscopy:
-reticulo-globular pattern
-irregularly distributed dots (circle)
-blue-white veil that covers all lesion
Dermoscopy in favor of dermal nevi and histopathology confirmed the diagnosis
Comments: The presence of irregular dots justified extirpation
to rule out a melanoma arising from melanocytic nevi
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