Figure 4From: Merkel cell carcinoma metastasis and dermatofibrosarcoma protuberans presenting as a collision tumour: a case report and review of the literature Haematoxylin and eosin stain of the collision tumour of the metastatic Merkel cell tumour within the tumour relapse of the dermatofibrosarcoma protuberans. Note the coexistence of a small cell tumour mass within a storiform, fascicular cell formation.Back to article page