case_images: PMC10629280_01
case_images: (a) Retroperitoneal fine-needle aspiration (FNA): Diff Quik Stain showing acellular, blue, amorphous material. (b) Retroperitoneal FNA: Pap stain showing acellular, greenish, rounded amorphous material. (c) Retroperitoneal FNA: Cell block with H and E stain showing hyaline deposits of amorphous eosinophilic material, amidst benign liver parenchyma (Low power view). (d) Retroperitoneal FNA: Cell block with H and E stain showing hyaline deposits of amorphous eosinophilic material (High power view).
case_images: Cytojournal-20-40-g001.jpg
case_images: PMC10629280_01_Cytojournal-20-40-g001.jpg
case_images: F1
case_images: A subsequent fine-needle aspiration (FNA)with a core biopsy revealed basophilic clumps of acellular homogenous material on Diff Quik stains performed during rapid on site evaluation [Figure 1a]. Pap stain showed greenish round deposits [Figure 1b], whereas cell block showed dense hyalinization and amorphous eosinophilic material amidst benign liver parenchyma [Figure 1c and d].
case_images: Retroperitoneal fine-needle aspiration: Congo red stain showing brownish red acellular, amorphous deposits.
case_images: Cytojournal-20-40-g002.jpg
case_images: PMC10629280_01_Cytojournal-20-40-g002.jpg
case_images: F2
case_images: The diagnosis was confirmed by positive Congo staining [Figure 2] with apple green birefringence [Figure 3].
case_images: Retroperitoneal fine-needle aspiration: Congo red stain showing apple green birefringence under polarized light.
case_images: Cytojournal-20-40-g003.jpg
case_images: PMC10629280_01_Cytojournal-20-40-g003.jpg
case_images: F3
case_images: The diagnosis was confirmed by positive Congo staining [Figure 2] with apple green birefringence [Figure 3].