ultrastructurally , they were characterized by interdigitating cytoplasmic processes , plasma membrane-associated dense patches , an incomplete basement membrane , junctional complexes , randomly oriented filaments without periodicity , cytoplasmic dense bodies , pinocytotic vesicles , clustering of mitochondria , and rare cilia-features of normal smooth muscle or of smooth-muscle tumors with classic histologic patterns .
C0010834
cytoplasmic
C1519091
pinocytotic vesicles