The remainder of the tumor was sent for histopathologic analysis, which exhibited features similar to those seen in the biopsy specimen, including the characteristic perivascular hyalinization; in addition, the vascular channels formed a vague staghorn pattern
Clear cell morphology and papillary formation were noted along with dilated thin vasculature, but no characteristic staghorn pattern
. The tumor focally attached to the surface of brain.
Histopathology shows diffuse subepithelial well delineated but un encapsulated cellular tumour (14) with proliferation of closely packed spindle cells in variety of pattern which includes diffuse, whorled and storiform, with characteristic hemangio-pericytoma like thin walled vessels with branching staghorn pattern
and frequent perivascular hyalinization of capillary sized vessels.
Dilated thin vasculature was noted, some with characteristic staghorn pattern
. No mention of reticulin stain was made on any of the reports, but slides were found for one case, which disclosed a rich pericellular reticulin pattern within the tumor.