DR [page 1] [Dermatology Reports 2011; 3:e1] A severe case of tetracycline- induced intracranial hypertension Anders Vedel Holst,1 Patricia L. Danielsen,2 Bertil Romner1 1Department of Neurosurgery, Rigshospitalet, Copenhagen University Hospital; 2Bispebjerg University Hospital, Department of Dermatology and Venerology, Copenhagen, Denmark Abstract Tetracykline is a first-line treatment of the common skin disorder acne vulgaris. A rare side effect of tetracycline treatment is intracranial hypertension also called pseudotu- mor cerebri (PTC). We report a severe case of PTC with cranial nerve palsy and visual loss in a 16 year old girl following acne vulgaris treat- ment with tetracycline. Introduction Pseudotumor cerebri (PTC) is characterized by elevated intracranial pressure without para- clinical or radiologic manifestations that is idiopathic or can be produced by various med- ications e.g. tetracycline. It most frequently occurs in obese women of childbearing age and the incidence in the general population has been estimated to 0.9 per 100,000.1,2 Because of increasing obesity the incidence might be rising. Clinically patients present with papilledema as the most important sign and symptoms of headache, visual distur- bances and photosensitivity.3 The most feared consequence is visual loss that may be severe and permanent, and cerebral ventriculoperi- toneal shunting may be necessary for sympto- matic treatment.4 Acne vulgaris is an extremely common skin disorder that affects virtually all individuals at least once in life with a peak at age 18. Inflammatory lesions include papules, pustules and nodules usually located to face, neck, chest, upper back and upper arms.5 For the moderate to severe form tetracycline is the first-line treatment of choice.6 Tetracycline has a bacteriostatic effect on p. acnes that possibly begins the inflammatory cascade leading to acne, though other unclear mechanisms of the drug also exist.7 Case Report A 16 year-old obese (BMI 32) girl, (Figure 1) otherwise healthy, was admitted to the Department of Neurosurgery on suspicion of PTC. During the last year she had experi- enced intermittent episodes of headache. Six weeks before admittance her GP had initiated tetracycline treatment 500 mg po per day because of acne vulgaris. Three weeks after her headaches worsened and no longer responded on acetaminophene, codeine or ASA treatment. She also experienced nausea and multiple episodes of vomiting. Four weeks after she developed diplopia and on her own initiative she stopped taking tetracy- cline. She was seen by an ophtalmologist who discovered bilateral papilledema and paresis of the right abducens nerve. Acetozolamide treatment po 250 mg two times daily was ini- tiated. CT and MR scans showed no patholog- ical findings and lumbar puncture showed no signs of infection. Pressure measurement was not performed. Four days later symptoms had worsened with further loss of vision, bilateral abducens nerve palsy and a fixed dilated right pupil. The patient was trans- ferred to the Department of Neurosurgery where an external ventricular drain (EVD) was inserted in the right lateral ventricle. Initial intracranial pressure was measured to 42 mmHg (normal pressure 5-15 mmHg). Drainage volumes were as high as 400 mL/day. Intracranial pressure was measured every hour and near-normalized to about 20 mmHg. After placement of EVD headache resolved completely and bilateral abducens palsy cleared. Two days later the drain was converted to a permanent ventriculoperi- toneal shunt. Discussion The general practitioner as well as the der- matologist is often confronted with patients with acne vulgaris. PTC can occur idiopathic in obese women, even without the use of medica- tion. Obese women with a history of headache treated with tetracycline, doxycycline, minocy- line and isotretinoin complaining of worsening in intensity or frequency should evoke suspi- cion of this rare complication on a low thresh- old. Combination therapy with tetracycline and retinoids may hold a higher risk of PTC. References 1. Ireland B, Corbett JJ, Wallace RB. The search for causes of intracranial hyperten- sion. Arch Neurol 1990;47:315-20. 2. Durcan FJ, Corbett JJ, Wall M. The inci- dence of pseudotumor cerebri: population studies in Iowa and Louisiana. Arch Neurol 1988;45:875-7. 3. Wall M, George D. Idiopathic intracranial hypertension: a prospective study of 50 patients. Brain 1991;114:155-80. 4. Bynke G, Zemack G, Bynke H, Romner B. Ventriculoperitoneal shunting for idio- pathic intracranial hypertension. Neurol - ogy 2004;63:1314-16. 5. Brown SK, Shalita AR. Acne vulgaris. Lancet 1998;351:1871-6. 6. Haider A, Shaw, JC. Treatment of acne vul- garis. JAMA 2004;292:726-35. 7. Friedman DI. Medication-induced intra - cranial hypertension in dermatology. Am J Clin Dermatology 2005;6:29-37. Dermatology Reports 2011; volume 3:e1 Correspondence: Patricia L. Danielsen, Bispebjerg University Hospital, Department of Dermatology and Venerology2, Copenhagen, Denmark. E-mail: patriciadanielsen@yahoo.dk Key words: tetracycline, intracranial hypertension. Received for publication: 27 September 2010. Revision received: 13 October 2010. Accepted for publication: 18 October 2010. This work is licensed under a Creative Commons Attribution 3.0 License (by-nc 3.0). ©Copyright A.V. Holst et al., 2011 Licensee PAGEPress, Italy Dermatology Reports 2011; 3:e1 doi:10.4081/dr.2011.e1 Figure 1. 16-year old girl with moderate acne vulgaris after insertion of external ventricular drain. No n- co mm er cia l u se on ly