PMC5680643_01
Axial T1-weighted (a), T2-weighted fat-saturated (b), sagittal T1-weighted post-gadolinium fat-saturated (c), coronal T1-weighted (d), and T2 fat-saturated (e) images demonstrating a complex precoccygeal cystic structure with multiple septations and fluid content of different signals and fluid levels
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F1
Magnetic resonance imaging (MRI) of the pelvis revealed a complex cystic structure anterior to the coccyx [Figure 1].
Coronal CT (a) and 3D reconstruction (b) of the coccyx status post resection of previously identified teratoma in the precoccygeal region
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F2
The differential diagnosis included meningocele and chordoma [Figure 2].
A solid cystic tumor (a, gross) containing yellow seromucoid fluid (b, gross)
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F3
An osteotome cut through the coccyx 6 cm above the tip [Figure 3].
Histology of the mass demonstrating various types of mature tissue elements including lobules of smooth muscle, adipose tissue, stratified squamous epithelium (a, H and E, x4; b, H and E, x20) respiratory type ciliated epithelium (c, H and E, x40; and mucous glandular tissue adjacent to stratified squamous epithelium (d, H and E, x10)
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F4
Gross analysis revealed an irregular tumor with cystic nodules attached to a firm portion of the coccyx [Figure 4].