case_images: PMC5680643_01
case_images: 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
case_images: SNI-8-260-g001.jpg
case_images: PMC5680643_01_SNI-8-260-g001.jpg
case_images: F1
case_images: Magnetic resonance imaging (MRI) of the pelvis revealed a complex cystic structure anterior to the coccyx [Figure 1].
case_images: Coronal CT (a) and 3D reconstruction (b) of the coccyx status post resection of previously identified teratoma in the precoccygeal region
case_images: SNI-8-260-g002.jpg
case_images: PMC5680643_01_SNI-8-260-g002.jpg
case_images: F2
case_images: The differential diagnosis included meningocele and chordoma [Figure 2].
case_images: A solid cystic tumor (a, gross) containing yellow seromucoid fluid (b, gross)
case_images: SNI-8-260-g003.jpg
case_images: PMC5680643_01_SNI-8-260-g003.jpg
case_images: F3
case_images: An osteotome cut through the coccyx 6 cm above the tip [Figure 3].
case_images: 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)
case_images: SNI-8-260-g004.jpg
case_images: PMC5680643_01_SNI-8-260-g004.jpg
case_images: F4
case_images: Gross analysis revealed an irregular tumor with cystic nodules attached to a firm portion of the coccyx [Figure 4].