case_images: PMC10940339_01
case_images: Ultrasound findings of the masses on the penis and in the left groin area. (A) A hypoechoic mass (arrow) with a hyperechoic capsule on the dorsal side of the penile shaft (arrowhead). (B) The distal part of the mass (arrow) does not involve the glans (arrowhead). (C) Posterior acoustic enhancement and multiple linear hyperechoic separations can be seen inside the penile mass. (D) Vascularity of the penile mass was not abundant on color Doppler flow evaluation. (E) A homogeneous hypoechoic mass in the groin area. (F) The inguinal mass showed hypovascularity on Color Doppler ultrasonography.
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case_images: f1
case_images: A well-defined homogeneous hypoechoic mass without notable septa was found in the left groin area ( Figure 1 ).
case_images: CT scan findings of the penile mass. (A) CT plain scan: a uniform low-density mass (arrow) was seen under the penile skin. (B) Enhanced CT: No definite enhancement of the mass (arrow) after enhancement.
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case_images: f2
case_images: No definite enhancement was displayed on postcontrast images ( Figure 2 ).
case_images: Intraoperative imagings of penile and inguinal schwannomas. (A) Grossly, palpable tissue mass was observed on the dorsum of the penis, near the base of the shaft, with a bumpy, multi-nodular appearance (arrow). (B) Intraoperative findings suggested that the yellow mass between the deep and superficial fascia on the dorsal side of the penis was multi-nodular and demarcated from the corpus cavernosum. (C) Final gross specimens of the penile mass (right) and inguinal mass (left) were all yellow nodular. (D) Postoperatively, the appearance of the penis was less affected.
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case_images: f3
case_images: The appearance of the penis was not notably impacted postoperatively ( Figure 3 ).
case_images: Final pathology of penile mass specimen excised during operation. Hematoxylin-eosin (H&E) stain: (A) The tumor was divided into multiple nodules by fibrous tissue (HE,x10). (B) Hypercellular Antoni A areas: compact spindle cells with no atypia or mitoses arranged in bundles or interlacing fascicles. Hypocellular Antoni B areas: spindle cells arranged haphazardly in a loose stroma. (HE, x200). Immunohistochemistry stain: (C) Diffuse expression of S100. (D) S100 expression primarily concentrated in the nucleus of Antoni A areas.
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case_images: f4
case_images: Hematoxylin-eosin (H&E) staining ( Figures 4A, B ) showed that fibrous tissue divided the tumor into multiple nodules. Immunohistochemistry staining demonstrated diffuse expression of S-100 ( Figure 4C ), mainly in Antoni A areas and primarily concentrated in the nucleus ( Figure 4D ).