(I) Congenital Lesions:
1- Congenital umbilical hernia & Exomphalos.
2- Anomalies of vitillointestinal duct:
- Congenital faecal fistula.
- Umbilical polyp or enterocytoma (under the umbilicus).
- Vitello-intestinal band.
3- Anomalies of the urachus:
- Congenital urinary fistula. - Urachal cyst.
(II) Acquired lesions:
[A] Inflammations:
1- Omphalitis in newly born: "Serious" may give .
- Tetanus neonatorum.
- Local sepsis causee spread of infection through patent umbilical vein resulting in portal pyaemia & septicaemia.
2-Omphalitis in adult: "Not serious" due to lack of cleanliness. An inspissated mass of dirt and desquamated epithelium form hard mass. (Umbilical stone).
[B] Acquired fistula:
- Faecal due to: post-operative & specific infections.
- Biliary due to: subacute perforation of inflammed G.B.
[C] Neoplasm:
- 1ry carcinoma: rare e.g. epithelioma or malig. melanoma.
- 2ry carcinoma; more than 1ry from intra-abdominal malignancy or CA breast.
[D] Endometriosis: which cause pain & bleeding during menses after puperty.
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