[Black tumor of the umbilicus]

Fatima-Zahra Agharbi
The Pan African medical journal · 2019 · doi:10.11604/pamj.2019.33.319.15697 · PMID:31692970 · PMC6815523
other OA: gold CC-BY-4.0
📄 Open PDF Full text JSON View on PubMed View at publisher
⚙ AI-generated summary by claude@2026-06, 2026-06-13 ⓘ

This case study reports the diagnosis and resection of a rare atypical congenital melanocytic nevus presenting as a pigmented umbilical nodule in a young girl.

One-sentence paraphrase of the abstract; not a substitute for reading it. No clinical advice. How this works

⚙ AI-generated deep summary by claude@2026-06, 2026-06-13 · read from full text ⓘ

The paper describes a case report of a congenital melanocytic nevus (benign melanocytic tumor) presenting as a pigmented nodule at the umbilicus, a rare anatomical location. A young girl was evaluated for a lesion present since birth that became bothersome more recently; based on the clinical appearance, differential diagnoses included nevus, melanoma, and endometriosis. Surgical excision confirmed the diagnosis of nevus. This paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.

Read from the paper's body, not the abstract. Not a substitute for reading the paper. No clinical advice. How this works

Abstract

Pigmented nevi, still called melanocytic nevi or more improperly "naevus naevocellulaires" are benign melanocytic tumors characterized by a proliferation of melanocytes near the dermoepidermal junction. They are grouped in clusters or in theca cells that differentiate them from normal melanocytes. They occur at birth in approximately 1% of newborns with no sex predominance. Their occurrence is mostly sporadic, although rare family forms have also been reported. They can be separated in an arbitrary manner according to their diameter on the day of the birth: small congenital nevi 20cm. Umbilical nevi are rare. We here report an interesting case of atypical and rare congenital nevus. The study involved a young girl presenting with pigmented umbilical nodule occurred at birth which had recently become problematic. We suspected a nevus, a melanoma or an endometriosis on the basis of the clinical appearance of this nodule. Resection was performed. The diagnosis of benign melanocytic tumor was confirmed.
Full text 1,230 characters · extracted from pmc-nxml · 1 sections · click to expand

Image

Les nævus pigmentaires, encore appelés nævus mélanocytaires ou plus improprement « nævus nævocellulaires » sont des tumeurs mélanocytaires bénignes caractérisées par une prolifération de mélanocytes à proximité de la jonction dermoépidermique, avec un regroupement en amas ou thèques qui les différencient des mélanocytes normaux. Les nævus congénitaux sont présents dès la naissance et surviennent chez environ 1% des nouveau-nés sans prédominance de sexe. Leur survenue est très majoritairement sporadique, bien qu'existent aussi de rares formes familiales. Ils peuvent être séparés de manière arbitraire en fonction de leur plus grand diamètre le jour de la naissance: petits nævus congénitaux si à 20cm. L'ombilic est une localisation rare de naevus. Nous rapportons un cas de nævus congénital dont la localisation atypique et rare nous a paru intéressante à rapporter. Il s'agit d'une jeune fillette qui consultait pour un nodule pigmenté de l'ombilic remontant à la naissance devenu gênant récemment. Devant cet aspect clinique nous avons évoqué: un nævus, un mélanome ou une endométriose. Une exérèse a été réalisée confirmant le diagnostic de nævus. Nodule pigmenté de l'ombilic

Text is read by the "Ask this paper" AI Q&A widget below. Extraction quality varies by source — PMC NXML preserves structure cleanly, OA-HTML may include some navigation residue, and OA-PDF can have broken hyphenation. The publisher copy (via DOI) is the canonical version.

My notes (saved in your browser only)

⚙ Ask this paper AI returns verbatim quotes from the full text · source: pmc-nxml ⓘ

Answers must be backed by verbatim quotes from this paper's full text. Hallucinated quotes are dropped automatically; if no verbatim passage answers the question, we say so. How this works

Condition tags

endometriosis

Citation neighborhood (no data yet)

We don't have any in-corpus citations linked to this paper yet. The paper's references may be in our DB but unresolved to ``paper_id`` (resolution happens at ingest when the cited DOI matches a row we already have). Run the cross-source citation reconcile pass to retry.

Source provenance

europepmc
last seen: 2026-06-25T06:14:32.897245+00:00
pubmed
last seen: 2026-05-13T22:22:29.487098+00:00
unpaywall
last seen: 2026-05-14T19:30:52.867331+00:00
License: CC-BY-4.0 · commercial use OK · attribution required
Courtesy of the U.S. National Library of Medicine