Rhabdomyosarcoma MRI

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1];Associate Editor(s)-in-Chief: Shadan Mehraban, M.D.[2]

Overview

MRI is used for for evaluation of primary tumor and its invasion. MRI is used for diagnosis of primary location of rhabdomyosarcoma located in head and neck, paraspinal, parameningeal regions, extremities, and pelvic tumors. MRI features in rhabdomyosarcoma are characterized by low to intermediate intensity on T1, hyperintense on T2, and considerable contrast enhancement on T1 contrast.

MRI

• MRI is used for for evaluation of primary tumor and its invasion.
• MRI is used for diagnosis of primary location of rhabdomyosarcoma located in:
  • Head and neck
  • Paraspinal
  • Parameningeal regions
  • Extremities
  • Pelvic tumors
• MRI findings or rhabdomyosarcoma are:
  • T1:
    • Low to intermediate intensity
    • Hemorrhage areas are present in alveolar rhabdomyosarcoma
  • T2:
    • Hyperintense
    • Prominent flow voids are present in extremity lesions of rhabdomyosarcoma
  • T1 C+ (Gd):
    • Considerable enhancement

A 6 year old boy presented by lump on the thumb and gradually increasing in size over the last month. MRI shows abnormal belly of opponens pollicis with T2 hyperintensity and abnormal enhancement.Source: Case courtesy of Dr Jeremy Jones, from Radiopadia A 2 year old girl presented with buttock mass with no underlying infection. MRI shows a large and irregular soft tissue mass in medial aspect of the right buttock that is centered on muscle, but crosses into the subcutaenous fat. It is T2 hyperintense, diffusion restricts and enhances peripherally following contrast.Source: Case courtesy of Dr Jeremy Jones, from Radiopedia A 10 years old girl presented with persistent headaches for several months and an irritating intraoral sensation.Centered on the right middle cranial fossa is a bilobed mass lesion that diffusion restricts and enhances avidly.Source: Case courtesy of Dr Jeremy Jones, from Radiopaedia References