A case of Churg-Strauss syndrome presenting with foot drop

ABSTRACT

BACKGROUND: Churg-Strauss syndrome (CSS), or eosinophilic granulomatosis with polyangiitis, is a rare syndrome that affects small- to medium-sized arteries and veins. Criteria for the diagnosis include: asthma (wheezing, expiratory rhonchi), eosinophilia of more than 10% in peripheral blood, paranasal sinusitis, pulmonary infiltrates (may be transient), histological proof of vasculitis with extravascular eosinophils, and mononeuritis multiplex or polyneuropathy. The worldwide incidence of CSS is approximately 2.5 cases per 100,000 adults per year and its incidence in the United States is one to three cases per 100,000 adults per year.1 In the Philippines, the exact incidence is unknown with very few published case reports about it.SETTING: University of the Philippines-Philippine General Hospital (UP-PGH), a tertiary training hospital in Manila, PhilippinesTHE CASE: A 40-year-old Filipino male with a history of adult onset asthma and recurrent sinusitis manifesting with inability to dorsiflex the left ankle (foot drop), various dermatologic lesions, and arthralgia. Complete blood count showed hypereosinophilia. Electromyography revealed asymmetric moderate to severe sensory and motor denervation of limbs compatible with polyneuropathy. Skin biopsy revealed lymphocytic vasculitis. P-ANCA was positive. During his incumbent hospitalization, the skin lesions, arthralgia and neurologic manifestations improved on administration of high dose steroids. Pregabalin was used to control pain secondary to the mononeuritis multiplex.SIGNIFICANCE: To report a rare case of ChurgStrauss syndrome presenting as foot drop. This case highlights the importance of considering ChurgStrauss syndrome among adult patients presenting with neurologic complaint (inability to dorsiflex the left ankle/foot drop) and various dermatologic lesions.