In a 73-year-old woman, on the leg
What to see at dermoscopy:
-cerebriform pattern
-fissures and ridges
-sharp borders
-scar-like depigmentation (lower portion of lesion)
-scaly surface at the lower portion of lesion
Although dermoscopy is in favor of seborrheic keratoses, biopsy at the lower portion of lesion was indicated to rule out a squamous cell carcinoma.
Hitopathology correlation: actinic keratoses.
In a 46-year-old man, on the chest
What to see at dermoscopy:
-regular reticular pigment network
-well-demarcated, red, oval structure (lacunae) at the left side of the lesion
Dermoscopy in favor of junctional nevus and cherry hemangioma (senile angiomas)
Comments: remember that when two different neoplasms are associated in the same biopsy specimen it is called a “collision tumor”.
For more information: Boyd AS et al. Cutaneous collision tumors. An analysis of 69 cases and review of the literature. Am J Dermatopathol. 1994 Jun;16(3):253-7
In a 76-year-old man, on the cheek
What to see at dermoscopy:
-milia-like cysts
-cerebriform pattern (right side lesion)
-pseudonetwork with a annular-granular pattern (left side lesion)
Biopsy of left side lesion was indicated.
Histopathological correlation : actinic keratosis
Comments: when two different pathologies are associated on the same site [seborrheic keratosis (the right side lesion) and actinic keratosis (left side lesion)] it constitutes what is called a “collision tumor”.