CLINICAL SUMMARY

LEFT PELVIS

A 49-year-old woman, with a radiologically aggressive pelvic mass underwent a left hemipelvectomy. A 15.0 x 11.0 x 9.0 cm tan-yellow mass occupying the medullary cavity of the iliac bone and extending into the surrounding soft tissues was identified. The cut surface of the mass was variegated tan-brown and myxoid with large foci of necrosis intermixed with areas having a more blue-gray chondroid appearance.

The master list with the correct answer

1. Chondroblastic osteosarcoma
2. Chondrosarcoma
3. Dedifferentiated chondrosarcoma
4. Enchondroma
5. Synovial chondromatosis

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PREVIOUS CASE: MEDIASTINUM, POSTERIOR
A 32-year-old man with no significant previous medical history presented with sweating, headaches, and palpitations. A CT scan revealed a mass in his posterior mediastinum. Grossly, the 125 g mass measured 7.9 x 6.5 x 5.3 cm and was partially encapsulated with a deep red to pink cut surface. Sectioning revealed a single 3.1 cm cyst filled with serosanguinous fluid surrounded by red-pink, soft parenchyma. 
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