Erythrodermic Cutaneous T-Cell Lymphoma in Elderly Diabetic Patient

Case at a Glance

A 65-year-old female with type 1 diabetes mellitus presented with progressive erythrodermic rash covering 93% of body surface area, initially misdiagnosed as eczema, subsequently confirmed as cutaneous T-cell lymphoma with regional lymphadenopathy.

Patient's Story

The patient developed a widespread cutaneous eruption characterized by raised papules, desquamation, and erythematous patches distributed over nearly her entire body surface. The lesions had been present for several months and were recurrently complicated by secondary bacterial infections. Initial treatment with topical corticosteroids and systemic antibiotics provided temporary improvement, but the condition persisted and progressed.

Initial Assessment

Physical examination revealed extensive erythrodermic changes affecting approximately 93% of the patient's body surface area, with raised inflammatory lesions, scaling, and patches of erythema. The patient's medical history was significant for type 1 diabetes mellitus. Initial differential diagnosis included severe atopic dermatitis, drug eruption, and cutaneous lymphoma.

The Diagnostic Journey

Given the extensive nature and persistence of the eruption, a comprehensive workup was initiated. Skin biopsy was performed for histopathological analysis. Complete blood count and comprehensive metabolic panel were obtained and demonstrated normal parameters. Computed tomography imaging was conducted to evaluate for systemic involvement, which revealed enlarged regional lymph nodes but no evidence of organ involvement.

Final Diagnosis

Histopathological examination of the skin biopsy confirmed the diagnosis of erythrodermic cutaneous T-cell lymphoma. The pathology report specifically noted interstitial granulomatous dermatitis with lymphomatous infiltration. Given the extensive body surface area involvement (>80%), this case represents advanced-stage cutaneous lymphoma.

Treatment Plan

The patient was started on systemic corticosteroid therapy, which resulted in significant suppression of the cutaneous manifestations. Referral to a specialized oncology/hematology service was arranged for comprehensive staging, including flow cytometry analysis and consideration of systemic treatment options appropriate for advanced cutaneous T-cell lymphoma.

Outcome and Follow-up

The patient responded favorably to initial corticosteroid treatment with marked improvement in skin lesions. Ongoing management will require multidisciplinary care involving dermatology, oncology, and endocrinology given her underlying diabetes. Long-term prognosis will depend on specific lymphoma subtype, molecular characteristics, and response to targeted therapy.