PMC5821967_01
Magnetic resonance imaging (MRI) findings. (a) Coronal plane, noncontrast, T1-weighted, STIR images (   , subpubic cyst). (b) Sagittal plane, gadolinium-enhanced, T1-weighted image, showing compression of the ureter from the anterior, and axial plane T2-weighted image.
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fig1
A urethral catheter was visible on the posterior aspect of the mass lesion, which had been placed for treatment of the acute urinary retention disorder (Figure 1).
An intraoperative photograph after bilateral pelvis osteotomy for excision of the subpubic cartilaginous cyst, including the pubic symphysis.
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fig2
After the 2 cm en bloc resection, the remnants of the pubic bone separated further, to about 4 cm (Figure 2).
Pathological findings. (a) Macrophotography of the pubic symphysis and subpubic cyst; the whole image of the microphotograph is shown. (b) From the capsule to the margin of the mass, Masson trichrome (MT) staining identified fibrocartilage as the main tissue. (c) Microscopic section (magnification 100x) of the center of the cyst, with MT staining revealing denatured fibrocartilage, with a fiber-rich section. Alcian blue (ALB) staining revealed an abundant mucous substance, which included a modified product derived from the cartilage. (d) Microscopic section (magnification 400x) of the center of the cyst, showing positive staining of the cartilage tissue using S100 protein immunohistochemistry.
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fig3
The yellowish tissue was confirmed to be the degenerated fibrocartilage tissue, with no evidence of malignancy (Figure 3).
Postoperative standing radiographs (anterior-posterior view) of the pelvis and hips, obtained immediately after surgery (a) and at 4 years postoperatively (b). (c) and (d) Magnetic resonance images obtained at 4 years postoperatively. There is no evidence of tumor recurrence.
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fig4
At the 4-year follow-up, urinary function remained normal, with no evidence of recurrence of the mass on MR imaging (Figure 4).