Proximal humerus neoplasm Note that the examination is limited by the patient's inability to tolerate the procedure and by the patient's body habitus.An aggressive soft tissue mass is seen situated adjacent to the infraspinatus muscle resulting in cortical destruction of the posterior aspect of the humeral head. It measures approximately 3.8 x 3.4 x 3.6 cm in the greatest transverse, craniocaudal, and AP dimensions and there is solid enhancement following gadolinium administration. Soft tissue edema and enhancement is seen surrounding the mass.There is abnormal marrow signal throughout the humerus extending from the level of the mass through the majority of the long bones. This is evidenced by abnormal increased marrow signal on coronal STIR sequence (series 9 image 11/19) and on T1 sequence (series 6 image 17/35) to the level of the distal metadiaphysis (series 6 image 17/35). Abnormal enhancement is also evident to the level of the distal metadiaphysis (series 12 image 15/32). Islands of normal marrow signal are interspersed throughout the diaphysis.
Aggressive soft tissue mass of the left humerus consistent with known sarcoma. Abnormal marrow signal extending throughout the humerus to the level of the distal metadiaphysis is concerning for malignant involvement.