In a 46-year-old man, on the back
What to see at dermoscopy:
-Multicomponent pattern
-Blue-white veil
-Clustered dots at periphery (circle)
-Chrysalys structures (arrows)
-Scar-like depigmentation
-Telangectasia over the regression area
-Erythema
Dermoscopy in favor of Melanoma and histology confirmed the diagnosis.
In a 76-year-old woman, on the leg (rapid evolution)
What to see at dermoscopy:
-multicomponent pattern
-globules
-radial streaming (arrow)
-irregular vessels
-chrysalis structures (circle)
-blue-white veil
-blotches
Extirpation was indicated
Dermoscopy in favor of melanoma
In a 53-year-old man, on the back
What to see at dermoscopy:
-multicomponent pattern
-pseudopods
-blue-white veil
-melanosis or peppering
-negative pigment network
-chrysalis structures
-erythema
Excision was indicated
Dermoscopy in favor of melanoma
Comments: chrysalis structures are well represented in the second picture.
Those white shiny streaks were first discribed in 2009 and their presence in melanoma correspond to changes in the composition and orientation of collagen in the underlying stroma.
For more information, read: Marghoob AA et al, Arch Dermatol 2009, 145: 618
In a 42-year-old man, on the forehead
What to see at dermoscopy:
-arborizing vessels and fine telangectasias
-blue-gray globules
-scar-like depigmentation
-ulceration with congealed blood
-erythema
-chrysalis structures
Biopsy was suggested.
Histopathology correlation: basal cell carcinoma with follicular differentiation
In a 35-year-old man, on the neck (intense photodamaged skin)
What to see at dermoscopy:
- asymmetry of color and shape
- multicomponent pattern
- pigment network and globules
- negative network
- blotches
-chrysalis structures
-milia-like cysts
Extirpation was suggested
Histopathological correlation: compound nevi
Comments: the presence of negative network is often seen in melanoma but is an infrequent dermoscopic finding in benign lesions (Spitz and congenital nevi) where it is usually symmetric and central.