Inexplicable Co- Existence of Eccrine Spiradenoma and Lichen Planus in an old Case of Basal Cell Carcinoma.

Eccrine spiradenoma is a rare benign adnexal tumour usually seen in the head, neck or upper trunk in young adults. It is rare in the lower extremities and in the elderly. Co- existence of eccrine spiradenoma with other lesions like cylindroma, trichoepithelioma, hidradenoma and chondroid syringoma has been documented in literature. But, concomitant occurrence of eccrine spiradenoma with a non- neoplastic lesion like lichen planus in an old and treated case of basal cell carcinoma has not been documented in literature till date. We present a rare case of eccrine spiradenoma occurring on the right thigh in an elderly female along with lichen planus over the left breast. The lady had been diagnosed with basal cell carcinoma 10 years ago and treated with wide local excision. A brief review of literature is also included.