Focal myositis of the iliopsoas muscle--a benign pseudotumour: ultrasound appearance in correlation with CT and MRI.

[focal myositis]

Focal myositis of the iliopsoas muscle is a rare condition . A case is presented , emphasizing the value of ultrasound for detection , localisation , image-guided biopsy and follow-up in correlation with CT and MRI findings .A 58 -year -old woman was referred to our clinic with strong left sided inguinal pain , which radiated to the thigh and had lasted for four days . Ultrasound , CT and MRI were performed . Ultrasound-guided biopsy with histological correlation was obtained and US -follow-ups were available .CT showed an enlarged iliopsoas muscle on the left side without any focal pathology or enhancement . MRI revealed a sharpely delineated lesion , which was hypointense to muscle in fat-suppressed T 1 w images with circumferential enhancement and showed a hyperintense appearance in T 2 w images . Ultrasound displayed a polylobulated , inhomogeneous and hypoechoic tumour within the iliopsoas muscle . Ultrasound-guided biopsy was found to be compatible with myositis . After oral therapy with steroids , improvement could be documented by serial ultrasound follow-up as the size of the tumour was definitely regressing .Focal myositis of the iliopsoas muscle is a rare entity which may mimic a tumoural lesion . Imaging findings may not be conclusive , and US -guided biopsy is recommended to rule out a malignant mass . Ultrasound seems to be the most cost-effective method for diagnosis , image guided biopsy and follow-up .

Diseases
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Diseases presenting "sharpely delineated lesion" symptom

focal myositis

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