Fig. 6
From: Adamantinoma of the distal femur diagnosed 5 years after initial surgery: a case report
Histopathology of the upper lung lesion. The tumor shows proliferation of spindle-shaped and squamoid epithelial cells with mild nuclear atypia, surrounded with fibrous stroma, which is strikingly similar to the histopathological findings of the femoral lesion (a). The epithelial cells spread around the alveolar wall without destruction of the alveolar structure (b). Immunostaining of thyroid transcription factor-1 demonstrates preserved epithelial cells of alveolar wall. The tumor cells are negative for thyroid transcription factor-1 (c)