Axillary and elbow lymph node metastasis arising after complete excision of microcystic adnexal carcinoma of a hand: A rare presentation.

Introduction: Microcystic adnexal carcinoma (MAC), a malignant transformation of adnexal structures, constitutes a rare locally aggressive malignancy of skin. Generally, the disease is associated with local invasion and distant metastases are extremely rare. We presented a case of MAC with distant metastasis after adequate wide excision.

Presentation Of Case: A 65-year-old man presented with a scar-like lesion at his left hand's middle finger. As pathologic result from incisional biopsy confirmed MAC, the patient was then treated with ray amputation. Eight years later, there was a presence of scar changes. There was a palpable node at medial epicondyle and presence of enlarged lymph nodes at axilla by imaging with Computed tomography (CT) scan. Following left hand amputation and node dissection at elbow and axillary region, pathologic examination confirmed recurrence and metastasis of MAC. He went through adjuvant radiation with a complete response. At present, two years after surgery, he remains in complete remission.

Discussion: The presence of a recurrent MAC with distant lymph node metastasis after primary surgery is rare. The metastatic route as presented with the positive nodes at elbow and axilla could be explained the spreading via lymphatic system.

Conclusion: MAC arising at a hand may require wider excision in order to achieve best result. Although this malignancy is a slowly progressive disease, distant metastasis should always be concerned, especially when there are suspicious presentations. CT scan will render more details and make more precise diagnosis in the suspicious situation.