[Soft tissue tumours on the back of the knee]

Soft tissue tumours behind the knee have rarely been described in literature. We have studied 74 patients with 79 tumours and pseudotumours in this area, and made a survey about pathology, clinical features, diagnosis, differentialdiagnosis and operative treatment. We have pointed out the varying nomenclature and confusion in definition ob a bursa and Baker's synovial herniation. The analysis of the casuistry showed predominantly gangliae, bursae and Baker's cysts. We have given special prominence to subfascial lipoma, malignant synovioma and nerve tumours as rare conditiones. Our own cases of synovioma and nerve tumours have been separately described.