Epidemiology

 no sex predominance (#12405913#)
 median age 67 years (range 19-81 years) (#12405913#)
 neck, arm, thigh and foot(#12405913#)

Synopsis

 highly mitotic myoid-appearing ovoid-to-spindle cells showing at least focally striking perivascular orientation resembling that seen in benign myopericytoma
 fascicular +/-
 thin-walled branching vessels +/-

Immunochemistry

 positivity for smooth muscle actin
 +/- dot-like desmin positivity

Prognosis

 possible metastases (#12405913#)

References

 McMenamin ME, Fletcher CD. Malignant myopericytoma: expanding the spectrum of tumours with myopericytic differentiation. Histopathology. 2002 Nov;41(5):450-60. PMID: #12405913#