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At birth, an otherwise healthy term female infant was noted to have a 3 cm3 blue-coloured tense cyst-like lesion attached by a skin-coloured pedicle to the ulnar aspect of the right hand, adjacent to the fifth metacarpal–phalangeal joint (figure 1). Over the following 48 h, the cystic lesion involuted and appeared necrotic, but …
Competing interests None declared.
Patient consent Obtained.
Provenance and peer review Not commissioned; internally peer reviewed.