4-year-old male with right forearm mass, biopsy revealed Plexiform Schwannoma. Evaluate for progression.EXAMINATION: MRI right forearm with and without intravenous contrast 12/9/2016 8:17 Lobular mildly enhancing mass is present in the right forearm occupying the anterior, lateral and posterior compartments. The mass has increased in size and now measures 5.8 cm (AP) x 3.9 cm (ML) x 13.7 cm (CC) (series 1201, image 14; series 1301, image 10), previously 4.2 cm (AP) x 2.8 cm (ML) x 11.8 cm (CC). The mass demonstrates slightly increased T1 signal intensity relative to skeletal muscle and hyperintense T2/STIR signal. The mass abuts the cortex of the radius and interosseous membrane with focal disruption of the cortex of the radius similar to prior (series 1201, image 21). Bone marrow signal intensity of the radius and ulna are normal. The mass displaces the adjacent tendinous and vascular structures.
Increasing size of biopsy proven plexiform schwannoma.