Hyaline cytoplasmic inclusions in human hepatoma. A case report.

A case of hepatoma in a 79-year old woman is reported. The patient had an enlarged liver and a pathological liver scintigram. Percutaneous liver biopsies were performed both with Menghini-and fine needles. The most prominent feature was the presence of hyaline cytoplasmic PAS-negative inclusions in liver parenchymal cells. There was no nuclear atypia. Electron microscopy disclosed two types of cytoplasmic changes. One consisted of a lamellar ultrastructure and was interpreted as a hyperplasia of smooth-surfaced endoplasmic reticulum. The other change consisted of smooth globular non-membrane limited regions containing amorphous or finely fibrillar material. This was interpreted as corresponding to the hyaline inclusions visible in the light microscope. The presence of PAS-negative hyaline cytoplasmic inclusions may thus be a sign of hepatoma. This may be of relevance for the diagnostic considerations of material obtained by fine needle biopsy.