Subcutaneous sarcoidosis of the upper and lower extremities: A case report and review of the literature.

backgroundSarcoidosis is a granulomatous disease of unknown etiology that most often impacts the lungs. Cutaneous manifestations of sarcoidosis are seen among 9%-37% of patients. Subcutaneous sarcoidosis is a rare presentation of cutaneous sarcoidosis with estimates of frequency ranging from 1.4%-16%. To date, very few articles and case reports have been written about this subject. In this paper, we describe a case of subcutaneous sarcoidosis and perform a review of the literature to determine if there are commonalities among patients who present with subcutaneous sarcoidosis. CASE SUMMARY: A 38-year-old female, with a past medical history of arthritis and recurrent nephrolithiasis, presents with an 8-mo history of 4 firm, asymptomatic, skin-colored nodules on her left and right upper extremities and neck. Needle biopsy and post-excisional pathology report both revealed well-formed, dense, non-caseating granulomas localized to the subcutaneous tissue. Chest computed tomography revealed mild mediastinal lymphadenopathy. A diagnosis of subcutaneous sarcoidosis was made, and the lesions were surgically removed.

conclusionCommonalities among patients presenting with subcutaneous sarcoidosis include: middle-aged female, lesions localizing to the upper or lower limbs, lymphadenopathy or pulmonary infiltration on chest imaging, elevated serum angiotensin-converting enzyme.