title: Exophthalmos, Diplopia, and Bilateral Eyelid Edema: Symptoms of Ocular Mastocytosis.
abstract: Mastocytosis is characterized by clonal mast cell proliferation with accumulation within various organs and uncontrolled activation with excessive mast cell mediator release. Ocular manifestations have rarely been published. We describe a 63-year-old man with bilateral exophthalmos that led to the diagnosis of systemic mastocytosis.
  
  
  
  A patient presented with bilateral eyelid edema with exophthalmos associated with binocular diplopia. Ophthalmologic examination showed bilateral axial, symmetrical, and painless exophthalmos with eyelid edema, and limitation in elevation of the right eye. Visual acuity was normal. Orbital magnetic resonance imaging showed increased volume of both the superior and medial recti muscles and right inferior oblique muscle, and histopathological examination of orbital fat and muscle biopsies revealed an infiltration by mast cells. Serum tryptase was elevated. The patient also complained of a long history of pruritis and diffuse skin erythema that could be elicited with just mild pressure (Darier's sign). A bone marrow biopsy confirmed the infiltration of abnormal mast cells with a D816V mutation in the KIT gene. Treatment with cladribine was initiated and resulted in resolution of both ocular and systemic signs and symptoms that persisted without relapse 18 months after discontinuation. Ocular mastocytosis is a rare condition, which was previously reported to involve the conjunctiva, cornea, uvea, eyelid, orbit, and choroid. Cases of ocular mastocytosis can be classified into two main groups: mast cells tumors (mastocytomas) and ocular manifestations associated with systemic mastocytosis. Histological examination of ocular samples is rarely performed, and there are no standard criteria for the diagnosis of ocular mastocytosis. Our case emphasizes cladribine could represent an alternative treatment.
  
  
  
  Our case is the first published case of exophthalmos and eyelid edema associated with systemic mastocytosis confirmed by pathologic examination of periocular biopsies that was treated effectively with cladribine.
authors: *MD †MD, PhD Service d'Ophtalmologie, Hôpital Gui de Chauliac, Montpellier (AP, MV, FM); Laboratoire de Biopathologie, Hôpital Gui de Chauliac, Montpellier (EF, VC); Faculté de médecine, Université Montpellier 1, Montpellier (EF, AS, NMdC, VC, MV); Médecine interne et Maladies multiorganiques, Hôpital Saint Eloi, Montpellier (AS); Service de Neuroradiologie, Hôpital Gui de Chauliac, Montpellier (NMdC); Laboratoire d'Anatomie et Cytologie Pathologique, Hôpital Necker-Enfants Malades, Paris (DC); Centre national de référence des mastocytoses (CEREMAST), Hôpital Necker-Enfants Malades, Paris (DC, OC); and Département d'hématologie adulte, Hôpital Necker-Enfants Malades, Paris, France (OC).
authors: Arnaud
authors: A
authors: Payerols
authors: Eric
authors: E
authors: Frouin
authors: Aurélie
authors: A
authors: Schiffmann
authors: Nicolas
authors: N
authors: Menjot de Champfleur
authors: Danielle
authors: D
authors: Canioni
authors: Olivia
authors: O
authors: Chandesris
authors: Valérie
authors: V
authors: Costes
authors: Max
authors: M
authors: Villain
authors: Frédéric
authors: F
authors: Mura
mesh_terms: D000284:Administration, Oral; D004172:Diplopia / Q000175:diagnosis* / Q000188:drug therapy; D004487:Edema / Q000175:diagnosis* / Q000188:drug therapy; D005094:Exophthalmos / Q000175:diagnosis* / Q000188:drug therapy; D005141:Eyelid Diseases / Q000175:diagnosis* / Q000188:drug therapy; D005938:Glucocorticoids / Q000008:administration & dosage; D006801:Humans; D007262:Infusions, Intravenous; D008297:Male; D034721:Mastocytosis, Systemic / Q000175:diagnosis* / Q000188:drug therapy; D008775:Methylprednisolone / Q000008:administration & dosage; D008875:Middle Aged; D011241:Prednisone / Q000008:administration & dosage; D014792:Visual Acuity
chemical_list: D005938:Glucocorticoids; D011241:Prednisone; D008775:Methylprednisolone