Umbilical mucosal polyp in an infant: a rare entity Mimicking umbilical granuloma

Umbilical lesions constitute a comparatively lesser percentage of the specimens received on a daily basis for histopathological examination. During embryological development, the umbilicus functions as a channel that allows flow of blood between the placenta and fetus. It also serves an important role in the development of the intestine and the urinary system. After birth, once the umbilical cord falls off, no evidence of these connections should be present. Nevertheless a few lesions are encountered related to the same. Patients with umbilical disorders present with drainage, a mass, or both. Umbilical granuloma, omphalomesenteric remnants, urachal remnants, hernias are few lesions in the umbilical region. We present a case of an umbilical polyp in an infant, which clinically suspected to an umbilical granuloma. The idea behind presenting this case was that, not only are umbilical polyps rare lesions but also it is necessary to differentiate it from umbilical granuloma as the treatments may vary. The clinicians and reporting pathologists must be aware of this rare congenital lesion.


Introduction
Congenital umbilical disorders represent a group of diverse anomalies according to the embryonic remnant found in the umbilicus [1]. Umbilical granulomas, polyps, patent vitello intestinal duct, cysts area few such lesions. Umbilical polyp is one such lesion, which usually presents in the neonatal period and clinically has close appear anceto umbilical granuloma [2]. Very few cases have been reported in literature which present the histopathological aspects of the same.

Case Report
A one year two months old male infant was referred to the Department of paediatric surgery of our hospital with the complaint of a non-healing remnant lesion in the region of the umbilicus.
The mother complained of occasion al bloody spots on the lesion. She also gave the history of application of topical ointments for the lesion after consulting a local doctor, how ever there was no change in the same.
No complaints of excessive crying/discomfort associated with the swelling were given. The baby was born at full term with no associated complications. Developmental milestone still date were normal. On examination, a small cherry-red nodular swelling was seen protruding out from the umbilicus [ Figure 1].
Surface of the swelling was smooth and glistening. Adjacent skin appeared unremarkable. Ultrasonography of the abdomen was normal.       Adjacent skin covered tissue fragments were unremarkable. A diagnosis of umbi infant had an uneventful postoperative stay and was discharged after five days. A fo no recurrence of the lesion.

Discussion
During the initial development al stages of intrauterine life, abroad communication develops between hemidgut and yolk sac. With fetal growth and elongation of the intestinal tract, this communication narrows, gi to the omphalo mesenteric duct. This structure is obliterated and loses its intestinal attachment by the end of the fifth to sixth intrauterine week; together with the yolk sac remnants, it is absorbed into the umb [3]. The umbilical cord then dries out and separates 2 to 3 weeks after the delivery and the underlying skin recovers, leaving no sign soft he cord. Total or partial impairment in closure of the omphalo mesenteric duct, which can happen in 2% of the new born, can result in a number of conditions, including umbilical enteric fistula, umbilical sinus, omphalomesenteric duct cyst, Meckel's diverticulum and umbilical polyp [4].
An umbilical polyp is one such congenital anomaly which represents the external remnant of the omphalo mesenteric duct. Umbilical polyps are generally regarded as innocuous but may be associate vitello-intestinal duct defects [4]. With an umbilical polyp, the umbilical region remains bright red with a granular appearance following the separation of the stump.
Clinically an umbilical polyp presents as a red, firm, round tumor with mucoid and / or blood tinged secretions in neonates. It bleeds easily, resists local treatment, is painless, and continues for months to years. Usually it is associated with visceral connections  During the initial development al stages of intrauterine ation develops between hemidgut and yolk sac. With fetal growth and elongation of the mmunication narrows, giving way to the omphalo mesenteric duct. This structure is al attachment by the end fifth to sixth intrauterine week; together with the yolk sac remnants, it is absorbed into the umbilical cord The umbilical cord then dries out and separates 2 to d the underlying skin leaving no sign soft he cord. Total or partial halo mesenteric duct, the new born, can result in a ding umbilical enteric umbilical sinus, omphalomesenteric duct cyst, Meckel's diverticulum and umbilical polyp [4].
An umbilical polyp is one such congenital anomaly ernal remnant of the omphalo mesenteric duct. Umbilical polyps are generally associated with other intestinal duct defects [4]. With an umbilical ains bright red with a rance following the separation of the presents as a red, firm, tumor with mucoid and / or blood tinged ly, resists local painless, and continues for months to ral connections and is composed of gastric mucosa, intestinal mucosa, and pancreatic tissues and in exceptional gastro intestinal mucosa also has been reported. A study of such polyps done by Helwigetal gastric mucosa to be the predominant type of tissue comprising the polyp [5].
Umbilical polyp scan be mistaken clinically for other common umbilical disorde granulomas and pyogenic granulomas. Umbilical granulomas are dry and velvety lesions mentioned lesions may present with umbilical discharge or hyperemia in the surrounding kin [6,7].
The presence of an umbilical polyp may indicate a persistent omphalomesenteric duct, which may complications such as an connection leading to prolapse or herniation of gastro intestinal contents, or as in our case, with the bladder resulting in persistent urinary discharge. Ultrasound and / or Computed is ideally recommended to rule out the associated intra abdominal anomalies, if any [4]. Cauterization of an umbilical polyp with silver nitrate solution or salt application is neither effective nor does it respond to conservative treatment unlike umbilical granuloma which responds to the same after two or three applications of silver nitrate [9].
The preferred treatment for umbilical polyp is surgical excision under aseptic condition, as it is not only curative, but also confirms the histology of the underlying tissue comprising the polyp. Early diagnosis of this lesion can facilitate the treatment and decrease the risk from associated complications.

Conclusion
An umbilical mucosal polyp is a distinct congenital lesion attributed to the remnant omphalo mesenteric duct. This lesion does not respond to conservative modes of treatment unlike umbilical granuloma with which it shares similar clinical features. Complete excision is not only diagnostic but also curative. The clinicians and reporting pathologists must be aware of this rare entity.