Introduction
Mycosis fungoides (MF), although uncommon, is the most common subtype of primary cutaneous T cell lymphoma that occurs in middle aged and elderly adults.1 MF has an indolent course, presents as erythematous scaly patches or plaques, and may progress to generalised erythroderma or cutaneous tumours. MF is often misdiagnosed at early stages due to non-specific clinical and pathological findings, and prognosis depends on the type and extent of skin involvement and extra-cutaneous invasion.2 Patients with MF are at high risk for developing secondary malignancies, including hematological malignancies.3,4 We, hereby report a case of Mycosis fungoides misdiagnosed and associated with underlying diffuse large B cell lymphoma.