[en] Objective: To evaluate the MRI features of sacrococcygeal pilonidal sinus. Methods: MRI of 11 patients with surgically proven sacrococcygeal pilonidal sinus disease was reviewed. The MRI features including location, opening and extent of the fistula as well as the relationship with adjacent structures were recorded. Results: All patients had sacrococcygeal subcutaneous fistulae with openings between the 5th sacral and 1st coccygeal vertebrae. The fistulae were localized in the subcutaneous tissue (n = 3) or extended superiorly (n = 8) between the 2nd sacral and 2nd coccygeal vertebrae. The fistulae were 2.5 to 8.8 cm in length with T₁ iso-hypointense and T₂ hyperintense mural thickening and contrast enhancement. The contents of the fistulae were T₁ isohyperintense and T₂ hyperintense without enhancement. Edema was shown in the surrounding soft tissues. There was no extension to the spinal canal or anal canal. Hair was found in 4/11 cases by pathological examination, but none was detected on MRI. Conclusion: Sacrococcygeal pilonidal sinus can be shown clearly on MRI for definitive diagnosis. (authors)

[en] Objective: To evaluate CT findings of cervical lymph node metastasis in patients with thyroid carcinoma. Methods: CT of 33 patients with thyroid carcinoma and cervical lymph node metastasis were retrospectively analyzed and compared with pathology. Results: On CT, 110/141 (78.6%) pathologically confirmed metastatic lymph nodes contained multiple punctate calcifications (35/110, 31.8%), appeared cystic (51/110, 46.4%), showed nodular (47/110, 42.7%), or homogeneous (12/110, 10.9%) contrast enhancement. Conclusions: Some characteristic CT findings of metastatic cervical lymph nodes in thyroid carcinoma may aid pre-operative diagnosis. (authors)