PMC9803812_01
A 10-cm sized soft bulging mass on the left buttock of a 66-year-old male. Front view (a) and lateral view (b).
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The mass was soft and movable like a simple cyst; however, a hard lump, approximately 2 cm in size, was palpable at the base (Fig. 1a, b).
Contrast-enhanced axial and coronal abdominal CT shows well-defined lobulating cystic mass (arrow) with focal enhancing solid portion (arrowhead) in the subcutaneous layer of the left gluteal area (a, b). Follow-up abdominal CT (c, d) after 8 years shows a progression state of cystic mass (open arrow) with enhancing solid portion (open arrowhead).. CT, computed tomography.
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CT findings were reexamined after examining the postoperative pathology results. Contrast-enhanced axial and coronal abdominal CT 8 years ago showed a well-defined lobulated cystic mass (arrow) with a focal enhancing solid portion (arrowhead) in the subcutaneous layer of the left gluteal area (Fig. 2a, b). Follow-up CT before surgery showed (Fig. 2c, d) the progression of the cystic mass (open arrow) with an enhancing solid portion (open arrowhead).
Gross pathology. First excision (a) and additional complete excision (b).
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No further treatments, such as radiotherapy, were performed because the tumor was well differentiated and resected with sufficient margins, and there were no residual tumors in the additional resected specimen (Fig. 3), and no local lymph node metastasis or distant metastasis was observed on CT or positron emission tomography.