PMC10025383_01
MRI revealed a perineal tumor. The arrow points out the location of the lump.
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Magnetic resonance imaging (MRI) revealed a well-circumscribed solid and homogeneous lump in the right perineum ( Figure 1 ).
PET-CT revealed a perineal tumor. The purpose of uppercase letters is to mark the position.
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Positron emission tomography-computed tomography (PET-CT) for initial staging showed a heterogeneous hypermetabolic mass in the right perineum and a fistula in the lump ( Figure 2 ).
Macroscopic image of the resected specimen.
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Macroscopically, the resected oval-shaped specimen measured 8 x 10 x 5 cm and was enclosed by a rim of fatty tissue ( Figure 3 ).
HE and immunohistochemical staining of the resected specimen. (A) HE staining showing polygonal tumor cells; (B-I) Immunohistochemical staining. The tumor cells were positive for CK (B), EMA (C), Vimentin (D), SMA (G), and CD34 (H), and negative forMyoD1 (E), and Myogenin (F).
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Immunohistochemical staining indicated that the tumor cells were CK (portion +), EMA (+), Vimentin (+), CK7 (-), CK20 (-), HMB45 (-), MyoD1 (-), Myogenin (-), Desmin (-), SMA (+), Actin (-), CD34 (+), S-100 (-), Calretinin (-), CD31 (-), and Bcl-2 (-) ( Figure 4 ).