Extraskeletal myxoid chondrosarcoma of the perineum.

Extraskeletal myxoid chondrosarcoma is an aggressive tumor with significant metastatic potential. A 40-year-old man presented with an asymptomatic mass at the left ischial fossa. Magnetic resonance imaging showed a 9x6-cm mass with variable signal intensity and cystic formations.

Extraskeletal chondroma of the foot.

Benign extraskeletal chondromas are uncommon lesions with a predilection for the hands and the feet and can exhibit worrisome radiographic and histologic features mimicking chondrosarcomas. The authors present herein the case of a 74-year-old man with a painful mass at the dorsomedial aspect of the left foot. At 34 months after surgery the patient is disease-free with no evidence of recurrence.

Current trends in the management of extra-abdominal desmoid tumours.

Extra-abdominal desmoid tumours are slow-growing, histologically benign tumours of fibroblastic origin with variable biologic behaviour. They are locally aggressive and invasive to surrounding anatomic structures. Magnetic resonance imaging is the modality of choice for the diagnosis and the evaluation of the tumours.