Solitary fibrous tumor of the orbit.

Solitary fibrous tumor (SFT) is a rare spindle-cell neoplasm originating from the mesenchyme. It was originally thought to occur exclusively in the intrathoracic region but has been recently described in extrapleural sites including the orbit. SFT of the orbit is a rare lesion, which can be misdiagnosed as hemangiopericytoma, fibrous histiocytoma, meningioma, or neurofibroma.

Relative value of immunohistochemistry in detection of mycobacterial antigen in suspected cases of tuberculosis in tissue sections.

Background: The diagnosis of tuberculosis (TB) depends on identification of the infecting organism. The diagnosis presents as a challenge due to its diverse clinical presentation and low yield of acid-fast bacilli (AFB) in tissue sections.

Aim: The aim of the present study is immunohistochemical localization of tubercle bacilli or their components that persist in the granulomas, but have lost the property of staining with acid-fast stain, assess the advantage of immunostaining over conventional Ziehl-Neelsen (ZN) staining and further to study the staining pattern on immunohistochemistry (IHC).