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  • Author or Editor: Richard W. Leech x
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George W. Sypert, Richard W. Leech and A. Basil Harris

✓ A case is reported of posttraumatic epidural true synovial cyst causing cauda equina compression. Surgical therapy resulted in satisfactory recovery.

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Richard W. Leech, Lee A. Christoferson and Roger L. Gilbertson

✓ A case of dysplastic gangliocytoma, or Lhermitte-Duclos disease, of the cerebellum is reported. The patient was the seventh reported survivor of this rare disease. A review of the known biology of the disease allows some optimism. The treatment of choice appears to be surgical resection only.

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Richard W. Leech, F. Tod Welch and George A. Ojemann

✓ A case is reported in which bilateral subdural hematomas were caused by metastatic adenocarcinoma in the subdural membranes. This diffuse dural carcinomatosis was associated with widespread intravascular tumor growth and a marked vascular and fibrous proliferation, interpreted as a tumor-induced angiodesmoplasia. The hematomas resulted from separation and hemorrhage into this highly vascular abnormal areolar layer of the dura.

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Colloid cyst of the third ventricle

A scanning and transmission electron microscopic study

Richard W. Leech, Thomas Freeman and Robert Johnson

✓ Three colloid cysts of the third ventricle were examined by both transmission (TEM) and scanning electron microscopy (SEM). There was morphological diversity of the cyst surface on SEM, with ciliated and non-ciliated cells present. In some areas, the non-ciliated cells were more numerous and extended above the surface. Individual non-ciliated cells show a wrinkled cell surface and bleb-like structures. The TEM findings correlated well with SEM, revealing two cell types. The non-ciliated cells appeared to have both exocrine and apocrine activity. In ciliated cells, abnormal cilia were related to abnormal centrioles; also present were highly abnormal microvilli. The appearance of the surface was similar to a normal ventricular surface. By allowing a greater assessment of cell types and their distribution, SEM has added one additional dimension in the evaluation of colloid cysts and their possible derivation.

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Allen R. Wyler, Richard W. Leech, Arden F. Reynolds, George A. Ojemann and Carl Mead

✓ The authors report a cholesterol granuloma that originated from the sphenoid sinus, eroded through the petrous apex, and presented as a tumor of the cerebellopontine angle. The differences between these rare tumors and cholesteatomas are discussed.