Pediatric narrow excision — averaging 2.1 mm of surgical margin — produced a 10.8% re-excision rate over a mean follow-up of 53.3 months in 43 atypical Spitz tumor patients reviewed in the October 2026 issue of the Journal of the American Academy of Dermatology (JAAD).

Of the 43 patients, 37 (86%) underwent narrow excision and 6 (14%) received wider excision with mean margins of 6 mm. Mean lesion size ran 6.6 mm in the narrow group versus 6.8 mm in the wide group. Mean age at surgery was 7.4 years.

What did re-excision actually look like?

Four of the 37 narrow-excision patients — 10.8% — returned to the operating room. Three of those four went back for positive pathology findings; the source does not document the indication for the fourth re-excision. Translated for families: roughly 1 in 10 children who had a narrow cut came back, and most of those came back because the lab, not the tumor, called the margin incomplete.

Where does the 6 mm standard come from?

Surgeons borrowed margins from adult melanoma protocols as a hedge against recurrence. Atypical Spitz tumors occupy a gray zone diagnostically between benign Spitz nevi and melanoma, and the field has historically treated them on the cautious end of that range — wider cuts, more general anesthesia, larger scars on small faces. The new series sits inside that tension: a mean lesion of 6.6 mm excised with a margin roughly a third of the lesion itself.

Three caveats temper the read

• Follow-up length. A mean of 53.3 months is long for pediatric work, but the cohort's mean age at surgery was 7.4 years, so late-adolescent and adult recurrences remain unmeasured.
• Comparator size. Six patients in the wider-excision arm is too small to compare outcome rates head-to-head.
• Mean, not all. The 2.1 mm figure is the average across 37 patients, not a uniform protocol applied across the series.

What does this change for clinicians?

It does not change practice by itself. It does give pediatric dermatologists a single-center number to cite when a family asks whether a centimeter-wide scar on a five-year-old's cheek is really necessary. The data say: most narrow cuts clear the lesion on the first pass, and most returns come back for margin status rather than biology.

What should change next?

A prospective, multi-institutional study with follow-up into late adolescence and beyond would firm up whether 10.8% stays flat as these patients age. Until that lands, surgeons should weigh margin width against lesion site, age, and pathology in the room — not apply a single number to every atypical Spitz tumor they see.