The Reactivity of Hydroxyl Radicals toward Boric Acid as a Function of pH.

Boric acid and its counter-base, borate, are a commonly used buffer pair in many systems where hydroxyl radicals are generated. Boric acid is also used in light water-cooled nuclear reactors to control the excess reactivity of the nuclear fuel. Hydroxyl radicals are generated within the cooling water of the reactor because of intense radiation.

Clear cell adult rhabdomyoma-a rare variant of an unusual tumour.

Adult rhabdomyoma is an uncommon benign mesenchymal neoplasm that most often occurs in the head and neck. We present a 70 year-old male with a swelling on the floor of the mouth. Subsequent excision of the tumor revealed a hitherto undescribed morphological variant of this tumor that features a predominance of clear cells, which on light microscopy may mimic other other clear cell tumours of the head and neck region.

Ocular Crystal-Storing Histiocytosis with Co-existing MALT Lymphoma-A Rare Case with Cytologic and Heretofore Not Reported Findings on Frozen Section.

Background: Crystal-storing histiocytosis (CSH) is a rare disorder which most commonly occurs in the setting of concurrent lymphoproliferative disease. Morphologically, it consists of aggregates of histiocytes containing eosinophilic crystalline material, which in most cases is composed of aggregated abnormal light chains.

Methods: Using histomorphology, immunohistochemistry and in situ hybridization, the authors characterize a rare case of orbital CSH associated with extranodal marginal zone (MALT) lymphoma and report for the first time the frozen section features of CSH.