GLOMANGIOPERICYTOMA
This is an uncommon tumor that contains glomus cells as well as cells intermediate in form between glomus cells and smooth muscle cells of the type seen in glomangiomyomas. Similar actin positive cells that could be interpreted as pericytes are found between capillaries in lobular capillary hemangiomas. Branching vascular outlines of the type seen in hemangiopericytomas and in some lobular capillary hemangiomas are found in this particular example.

See also the reference regarding this and other perivascular myoid tumors.


From the leg of a 14 year old male:
 
Scan power view showing a sharply delimited tumor
A low power view of the lower part of the tumor. Note the branching vascular outlines.
A medium power view of some of the tumor cells. Most of the cells are oval or spindle shaped. A few are round and have perinuclear clear zones (by arrows) and resemble glomus cells..
A high power view of some of the spindle cells. These are intermediate in form between glomus cells and smooth muscle cells.
A medium power view that shows tumor in the left side of the picture and a modified blood vessel in the right side of the picture. This type of modified blood vessel are sometimes found peripheral to the main mass of glomus tumors and their variants.
Reference:Granter SR, Badizadegan K, Fletcher CD.
     Myofibromatosis in adults, glomangiopericytoma, and myopericytoma:
     a  spectrum of tumors showing perivascular myoid differentiation.
    Am J Surg Pathol. 1998 May;22(5):513-25.

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