Primary actinomycosis mimicking urachal carcinoma
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Updated: Oct 4, 2026

Patient-derived Orthotopic Xenograft Models for Human Urothelial Cell Carcinoma and Colorectal Cancer Tumor Growth and Spontaneous Metastasis
Published on: May 12, 2019
Y Yeung1, M C Cheung, G S Chan
1Department of Division of Urology, University of Hong Kong Medical Center, Queen Mary Hospital, Hong Kong, People's Republic of China.
Abstract:
We report a case of urachal actinomycosis that presented with a progressively enlarging infraumbilical mass associated with umbilical discharge. Computed tomography revealed an extraperitoneal mass involving the dome of the bladder. The possible diagnosis included a malignant urachal neoplasm or chronic inflammatory mass. Partial cystectomy and excision of the mass was performed. The pathologic examination revealed actinomycosis. The patient was treated with a 6-month course of antibiotics. No recurrence was noted 1 year postoperatively.
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