Correspondence
Primary central nervous system lymphoma of the optic chiasm
Primary CNS lymphoma (PCNSL) is a rare form of extranodal, high-grade, non-Hodgkin lymphoma (NHL), accounting for approximately 3% of newly diagnosed brain tumors and 2 to 3% of all NHL.1 PCNSL can also arise from posttransplant lymphoproliferative disorder (PTLD), a disorder in patients with secondary immunodeficiency after a solid organ or hematopoietic stem cell transplant.2 PCNSL is characterized by rapid growth usually confined to the CNS and can originate in the brain, leptomeninges, spinal cord, or eyes.Fulminant idiopathic intracranial hypertension managed with oral acetazolamide
Idiopathic intracranial hypertension (IIH), also known as pseudotumour cerebri, is a syndrome of increased intracranial hypertension of unknown cause found predominantly in women of childbearing age and associated with an increased body mass index or a history of recent weight gain.1 The modified Dandy criteria for diagnosing IIH include (i) an imaging study confirming the absence of radiographic hydrocephalus or mass lesion, (ii) elevated cerebrospinal fluid (CSF) opening pressure (OP) upon lumbar puncture (LP) with normal CSF contents, and (iii) an intact neurologic examination with the exception of visual disturbances, sixth cranial nerve palsy, and papilledema.Pallid disc edema and choroidal perfusion delay in posthemodialysis nonarteritic ischemic optic neuropathy
Nonarteritic anterior ischemic optic neuropathy (NAION) is a rare but recognized ophthalmic complication in patients with end-stage renal disease (ESRD) on chronic hemodialysis characterized by unilateral or bilateral acute visual loss.1 Anemia, concomitant vasculopathic risk factors (i.e., diabetes, atherosclerosis), autonomic dysfunction, the hypotensive effect of hemodialysis, and physiologically small cup-to-disc ratios are among the predisposing factors to the development of ischemic optic neuropathy (ION) in this patient population.
