Table 2. Main differential diagnoses of EIMS.

Tumor	Immunohistochemistry
EIMS	ALK +, SMA +, EMA +/-, CK +/-, CD30 +, CD34 -, and Desmin +
GIST	CD117 +, DOG1 +, CD34 +, and Desmin -
ALCL	ALK +, SMA +, EMA +, CD30 +, and Desmin -
ELMS	ALK -, SMA +, EMA + and Desmin +
LGFMS	EMA +, MUC4 +, CD99, BCL2, SMA +/-, and Desmin +/-
RMS	ALK+/-, Myogenin +, MyoD1 +, Desmin +, SMA +, EMA -, CD30 -
MM	CK5 +, Calretinin +, EMA +/-, and Desmin -
Our case	ALK +, SMA +, CD30 +, CK-, EMA -, CD34 -, and Desmin +

ALCL, anaplastic large cell lymphoma; ALK, anaplastic lymphoma kinase ; BCL, B cell lymphoma; CD, cluster of differentiation; CK, cytokeratin; DOG1, discovered on GIST 1 ; EIMS, epithelioid inflammatory myofibroblastic sarcoma; EMA, epithelial membrane antigen; ELMS, epithelioid leiomyosarcoma, ; GIST, gastrointestinal stromal tumor; LGFMS, low grade fibromyxoid sarcoma; MM, malignant mesothelioma; MUC, mucin; MyoD1, myoblast determination protein 1; RMS, rhabdomyosarcoma; SMA, smooth muscle actin.