title: Primary localized amyloidoma of the renal pelvis: A case report and literature review.
abstract: Primary localized amyloidomas of the renal pelvis are challenging to diagnose, due to non-specific imaging results and the unusual location. The present study reports a rare case of primary localized amyloidoma of the renal pelvis and aims to illustrate the challenges in pre-operatively discriminating between this disease and transitional cell carcinomas. The present study identified that the mass was situated in the left renal pelvis using ultrasonography. A nephroureterectomy was performed following careful preparation. Finally, histopathological studies revealed that the tumor consisted of massive diffuse deposits of amyloid and microscopic amorphous eosinophilic material, which stained positively for Congo red, demonstrating potassium permanganate digestion. Consequently, a diagnosis of amyloid light chain-type amyloidoma was determined. Systematic examinations were performed following the unexpected diagnosis, which eliminated the possibility of amyloid associated-type amyloidoma. In total, 4 months post-surgery, the patient remained tumor-free.
authors.affiliation: Department of Graduate School, Anhui Medical University, Hefei, Anhui 230022, P.R. China; Department of Urology, State Key Laboratory of Oncology in Southern China, Sun Yat-sen University Cancer Center, Guangzhou, Guangdong 510060, P.R. China; Department of Urology, Shenzhen Second People's Hospital, The First Affiliated Hospital of Shenzhen University, Shenzhen, Guangdong 518035, P.R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Lu
authors.affiliation: Department of Urology, State Key Laboratory of Oncology in Southern China, Sun Yat-sen University Cancer Center, Guangzhou, Guangdong 510060, P.R. China.
authors.forename: Yanjun
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Graduate School, Anhui Medical University, Hefei, Anhui 230022, P.R. China; Department of Urology, State Key Laboratory of Oncology in Southern China, Sun Yat-sen University Cancer Center, Guangzhou, Guangdong 510060, P.R. China; Department of Urology, Shenzhen Second People's Hospital, The First Affiliated Hospital of Shenzhen University, Shenzhen, Guangdong 518035, P.R. China.
authors.forename: Meng
authors.initials: M
authors.lastname: Zhang
authors.affiliation: Department of Urology, State Key Laboratory of Oncology in Southern China, Sun Yat-sen University Cancer Center, Guangzhou, Guangdong 510060, P.R. China.
authors.forename: Yonghong
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Pathology, State Key Laboratory of Oncology in Southern China, Sun Yat-sen University Cancer Center, Guangzhou, Guangdong 510060, P.R. China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Cao
authors.affiliation: Department of Pathology, State Key Laboratory of Oncology in Southern China, Sun Yat-sen University Cancer Center, Guangzhou, Guangdong 510060, P.R. China.
authors.forename: Yongbo
authors.initials: Y
authors.lastname: Xiao
authors.affiliation: Department of Graduate School, Anhui Medical University, Hefei, Anhui 230022, P.R. China; Department of Urology, Shenzhen Second People's Hospital, The First Affiliated Hospital of Shenzhen University, Shenzhen, Guangdong 518035, P.R. China.
authors.forename: Zhiming
authors.initials: Z
authors.lastname: Cai
authors.affiliation: Department of Urology, State Key Laboratory of Oncology in Southern China, Sun Yat-sen University Cancer Center, Guangzhou, Guangdong 510060, P.R. China; Department of Urology, Shenzhen Second People's Hospital, The First Affiliated Hospital of Shenzhen University, Shenzhen, Guangdong 518035, P.R. China.
authors.forename: Song
authors.initials: S
authors.lastname: Wu
authors.affiliation: Department of Urology, State Key Laboratory of Oncology in Southern China, Sun Yat-sen University Cancer Center, Guangzhou, Guangdong 510060, P.R. China.
authors.forename: Fangjian
authors.initials: F
authors.lastname: Zhou
keywords: amyloidoma; nephrectomy; renal pelvis