Journal
AMERICAN JOURNAL OF SURGICAL PATHOLOGY
Volume 33, Issue 9, Pages 1386-1395Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/PAS.0b013e3181ac1927
Keywords
melanoma; sentinel lymph node; spitzoid melanocytic tumor; Spitz nevus
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Children and teenagers with a positive sentinel lymph node (SLN) after a prior diagnosis of an atypical spitzoid melanocytic tumor (ASMT) are usually cared for clinically in the same way as patients with melanoma. Little is known about long-term follow-up of these individuals to determine whether this practice is appropriate. To learn more about the biology of these tumors we retrospectively reviewed the clinical and pathologic findings of children and teenagers (< 18 y of age at the time of diagnosis) with an ASMT, positive SLN and follow-up of at least 3 years. Their findings were compared with histologically unambiguous melanomas of children or teenagers, who had a positive SLN or died of metastatic melanoma. Eleven individuals, 6 girls and 5 boys, with primary ASMT and positive SLN were identified. The primary tumors ranged in thickness from 2.1 to 12 mm (median, 4.6 mm; mean, 5 mm). The tumor mitotic rate ranged from I to 10 mitoses/mm(2) (median, 3/mm(2), median, 3/mm(2)). The positive SLNs included 6 nodes with intranodal melanocytic aggregates measuring < I mm in greatest dimension, and 5 nodes, in which the size of the melanocyte deposits was >= 1 mm. All the patients with ASMT and positive SLN remained free of disease with a median follow-up of 47 months (mean, 61 mo, range: 36 to 132 mo). In contrast, 2 of 5 patients < 18 years of age with a histologically unambiguous melanoma and a positive SLN died of metastatic melanoma. The overall disease-specific mortality rate for all patients < 18 years of age diagnosed with melanoma was 12%. Our findings confirm that children and teenagers with ASMTs and positive SLNs have a less aggressive clinical course than those with histologically unambiguous melanoma.
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