An 80-year-old woman was seen at the department of dermatology with a dark, stone-like nodule in the umbilicus. Extraction revealed an omphalolith; a benign naval stone consisting of keratin and sebum. It is often related to poor hygiene, and occurs more often in a deeply retracted umbilicus.
Sanne G Plug, Göran L van Rooijen. A woman with a dark nodule in the umbilicus]. Nederlands tijdschrift voor geneeskunde. 2020 Aug 06;164
PMID: 32779929
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