Focal Myositis of the Iliopsoas Muscle - A Benign Pseudotumour: Ultrasound Appearance in Correlation with CT and MRI

Abstract

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.

Skeletal muscle imaging and inflammatory myopathies

“…On CT, increased muscle bulk with low-density areas can be detected, reflecting inflammation and edema [14,17]. Intravenous contrast administration can delineate regions of hyperemia, which can be seen with focal abscesses.…”

Paraspinal and Iliopsoas Edema as a Marker of an Iliofemoral Thrombosis: Case Series Report

“…It is a benign inflammatory condition of unknown etiology. 7 This condition may be misdiagnosed with sarcomas, deep vein thrombosis and infection process but unlike the above It is characterized by spontaneous improvement and effectiveness of NSAIDs. Sometimes it may be recurrent.…”

Myosite focale d’Heffner

“…Les localisations préféren-tielles de la myosite focale sont les membres inférieurs. D'autres zones topographiques peuvent être intéressées : l'abdomen, la musculature fessière, le muscle psoasiliaque [5], l'avant-bras, la main (un doigt) [6], la musculature cervicale (le muscle sternocléïdomastoidien) [7], la langue, la musculature périorale, le muscle temporal [8]. La tuméfaction est spontanément douloureuse.…”