Tendon Sheath Tumour of Foot Tendon Sheath Tumour of Foot. Sagittal section of the foot showing rounded flattened lobulated tumour 2.5in diameter situated over plantar surface of heads of metatarsal bones. HISTOLOGY: Sections show masses of large spindle and polyhedral cells, some of which contain lipoid granules. The characteristic giant cells are not seen and there is infiltration of the surrounding tissue.
