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Fig. 1.
A. A 12-year-old boy underwent US examination. On the left side of the anus in soft tissues of the buttock there is an area with irregular, echogenically heterogeneous tissue sized about 22 × 23 mm with features of increased vascularization. The lesion has characteristics of an inflammatory infiltration. An abscess is beginning to form. B. US examination showed a fistulous tract originating from the abscess and reaching the skin
Fig. 2.
A 12-year-old girl underwent US examination, which showed a heterogeneous hypoechoic area (41 × 27 mm) and fluid with heterogeneously echogenic „thick” content in the area of the intergluteal fistula. There is an inflammatory infiltration of the surrounding tissues and a visible perianal abscess
Fig. 3.
Endorectal US in a 15-year-old boy showed a 18-mm long and 3–4 mm thick fistula reaching the sphincter