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Figure 1: Histopathology of balloons. Microcystic spaces with ovoid eosinophilic structures on haematoxylin and eosin (a and c) highlighted by Masson trichrome (d), PAS (e), and Alcian blue (f) stains. The tumor cells expressed GFAP (b) and EMA positive paranuclear dots (b-inset). [Original magnifications: a: 100×, b: 200×, c-e: 400×. Scale bars: a: 100 μm, b: 50 μm, c-f: 20 μm]

Figure 1: Histopathology of balloons. Microcystic spaces with ovoid eosinophilic structures on haematoxylin and eosin (a and c) highlighted by Masson trichrome (d), PAS (e), and Alcian blue (f) stains. The tumor cells expressed GFAP (b) and EMA positive paranuclear dots (b-inset). [Original magnifications: a: 100×, b: 200×, c-e: 400×. Scale bars: a: 100 μm, b: 50 μm, c-f: 20 μm]