Lower abdominal solitary fibrous tumor suspected as a urachal lesion: a case report with cytohistological correlation
Keywords:
Solitary fibrous tumor, Uncommon, Urachus, Intraabdominal
Abstract
Urachus is the embryological remnant of urogenital sinus and allantois. Benign urachal neoplasms including adenomas, fibromas, fibroadenomas, fibromyomas, and hamartomas have been reported. However, no cases of solitary fibrous tumour of the urachus have been reported. An 18 year old male presented with a lower abdominal mass with pain and urinary frequency. Computed tomography showed a mass abutting dome of the urinary bladder and anterior abdominal wall; however, the fat plane was maintained. Fine needle aspiration cytology was suggestive of a mesenchymal lesion. Surgical exploration revealed a mass attached to umbilicus on one end and dome of bladder on the other. Histopathological diagnosis was solitary fibrous tumor which was corroborated with immunohistochemistry findings. Patient has not reported back with recurrence. This case is being presented because of its unusual location and clinical suspicion of urachal lesion with no residual histological evidence of its remnant in the tumour.References
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3. Costa M, Oliva A, Velez A, Bento A, Garcia H, Oliveira F. Solitary Fibrous Tumor of the Abdominal Wall. J Clin Case Rep 2014;4:363.
4. Lau MI, Foo FJ, Sissons MC and Kiruparan P. Solitary fibrous tumor of small bowel mesentery : a case report and review of the literature. Tumori 2010;96:1035-1039.
5. Saanna GA, Bovee J, Hornick J, Lazar A. A review of the WHO classification of tumours of soft tissue and Bone 4th edition Lyon, IARC Press; 2013.
6. Demicco EG, Park MS, Dejka DM, Fox PS, Bassett RL, Pollock RE et al. Solitary fibrous tumor: a clinicopathological study of 110 cases and proposed risk assessment model. Modern Pathology 2012;25:1298-1306.
7. Moraa NS, Presmanesb MC, Monroyc V, Albinanab LC, Aladrob MH , Fernándezb EA. Clinicopathological Features of Solitary Fibrous Tumors of the Pleura: A Case Series and Literature Review. Arch Bronconeumol 2006;42:96-99.
8. Hasegawa T, Matsuno Y, Shimoda T, Hirohashi S, Hirose T, Sano T. Frequent Expression of bcl-2 Protein in Solitary Fibrous Tumors. Japanese Journal of Clinical Oncology 1998;28:86-91.
9. Khanchel F, Driss M, Mrad K, Romdhane KB. Malignant solitary fibrous tumor in the extremity : Cytopathologic findings. J Cytol 2012; 29: 139–141.
10. Mizusawa H , Oguchi T , Domen T , Koizumi K , Mimura Y , Saito T et al. Two cases of lower abdominal tumors difficult to differentiate from urachal tumors. Nihon Hinyokika Gakkai Zasshi 2014;105:1721.
Published
"01-11-2015"
Issue
Section
Case Report
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