case_images: PMC11786596_01
case_images: (A) Intraoperative view of right testicle with mass on epididymal tail. (B) Complete excision of right testicle epididymal tail mass.
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case_images: During the procedure, a 2 cm marble-like mass adjacent to the tail of the epididymis was identified and completely excised (Figure 1).
case_images: (A) Hematoxylin & Eosin (H&E) low power (4x) view of a fibroblastic tumor with a background of thick collagen (arrows) and associated inflammation.(B) (H&E) high power (10x) view of a lymphocytic cluster (right) and lymphocytes and plasma cells (arrowheads) coursing through the myofibroblastic background of thin spindled myofibroblasts (arrows).(C). Smooth muscle actin immunohistochemical stain at high power (40x) highlights the spindle cells, confirming myofibroblastic lineage (arrows). Smooth muscle actin also highlights the muscle wall of the blood vessels (D). ALK immunohistochemical stain at 10x, showing no reactivity. ALK positivity is present in only 50-60% of these tumors, thus not necessary for a diagnosis of Inflammatory myofibroblastic tumor.
case_images: CMAR-17-193-g0002.jpg
case_images: PMC11786596_01_CMAR-17-193-g0002.jpg
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case_images: Histology revealed a 2.4 cm IMT (Figure 2A and B) confirmed by immunohistochemistry (IHC) staining with scattered positivity of smooth muscle actin (Figure 2C), negative pancytokeratin, and negative anaplastic lymphoma kinase (ALK) (Figure 2D).