To investigate clinicopathological features of granulomatous slack skin (GSS) .

Clinical and pathological data were obtained from 6 cases of GSS, and analyzed retrospectively.

All the 6 patients were males, and presented with slack plaques and even pendulous skin folds. These skin lesions mainly affected flexural areas in 5 patients, and only occurred in the right chest in 1 patient. One patient was diagnosed with GSS complicated by mycosis fungoides (MF) . Histopathological examination showed non-caseating granulomas with infiltration of medium-sized lymphoid cells and multinucleated giant cells in the dermis in all the patients, atypical lymphoid cells in 1 patient, and epidermotropism in another patient. Immunohistochemical study revealed monoclonal CD4⁺ lympho-cytosis. Elastic fiber staining was performed in 4 patients, and showed crimp, fracture and disappearance of elastic fibers, and elastic fiber phagocytized by multinuclear giant cells in 2 patients. There were monoclonal rearrangements of T-cell receptor (TCR) γ gene in 2 patients. After radiotherapy with electron beam or superficial X-ray, lesions of 2 patients became smaller, and then were excised completely without recurrence. The other 4 patients received intramuscular injection of interferon α-2b and topical application of 0.02% mechlore-thamine solution, and their condition was improved.

GSS has a slowly progressive course, and overtreatment is not recommended. Surgical excision may be the first choice for GSS localized in flexural areas.

Lymphoma, T-cell, cutaneous; Cutis laxa; Mycosis fungoides; Skin manifestations; Pathology; Treatment outcome