Fig. 3
From: A rare pulmonary hamartoma: fibroleiomyomatous hamartoma
a The histopathological findings revealed the proliferation of spindle cells with eosinophilic cytoplasm arranged in an interlacing bundle and bronchial epithelium extending into the alveolar septa in the pulmonary parenchyma without a cartilaginous or adipose element. Mitotic figures were not observed. b An immunohistochemical analysis revealed that the spindle cells were positive for smooth muscle cell markers such as alpha-smooth muscle actin (SMA)