title: Pleomorphic hyalinizing angiectatic tumor of renal hilum.
abstract: Pleomorphic hyalinizing angiectatic tumor (PHAT) is a recently described rare entity. The tumor histogenesis is proposed to be of primitive undifferentiated mesenchyme. The tumor has a predilection for the subcutaneous soft tissue especially of lower extremity, although other locations have been well documented. We report a case of PHAT arising in the hilum of the kidney, clinically mimicking an infiltrating malignant neoplasm of renal pelvis. The tumor was discovered during workup for unrelated gastrointestinal tract symptoms. Because of the location of the lesion, excision of mass and radical nephrectomy were performed. The tumor had strong immunohistochemical expression of vimentin, CD34, CD99, and vascular endothelial growth factor (VEGF). No additional lesions were documented during 3 years of follow-up. This is consistent with the current thinking that PHAT is a benign neoplasm with increased incidence of recurrence. We document the unique retroperitoneal location of this rare tumor and suggest that PHAT should be considered among the list of unusual lesions at this site.
authors: Department of Pathology, Indiana University School of Medicine, Indianapolis, IN 46202, USA. midrees@iupui.edu
authors: Muhammad T
authors: MT
authors: Idrees
authors: Theodore
authors: T
authors: Kieffer
authors: Sunil
authors: S
authors: Badve
mesh_terms: D000071443:12E7 Antigen; D000368:Aged; D015703:Antigens, CD / Q000378:metabolism; D018952:Antigens, CD34 / Q000378:metabolism; D014408:Biomarkers, Tumor / Q000378:metabolism*; D015815:Cell Adhesion Molecules / Q000378:metabolism; D003937:Diagnosis, Differential; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006818:Hyalin / Q000378:metabolism; D007680:Kidney Neoplasms / Q000145:classification* / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D012171:Retinal Vessels / Q000473:pathology; D012187:Retroperitoneal Space / Q000473:pathology; D012983:Soft Tissue Neoplasms / Q000145:classification* / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D014057:Tomography, X-Ray Computed; D042461:Vascular Endothelial Growth Factor A / Q000378:metabolism; D014746:Vimentin / Q000378:metabolism
chemical_list: D000071443:12E7 Antigen; D015703:Antigens, CD; D018952:Antigens, CD34; D014408:Biomarkers, Tumor; C061828:CD99 protein, human; D015815:Cell Adhesion Molecules; D042461:Vascular Endothelial Growth Factor A; D014746:Vimentin