Histologic examination showed a neoplasm composed of sheets, nests, and fascicles of epithelioid and spindle cells in a fibrocollagenous
stroma, which in some areas were arranged in a pseudoalveolar pattern (Figure 1, A).
Histological sections revealed fibrocollagenous
cyst walls bilaterally, lined by pseudostratified ciliated columnar epithelium with areas of squamous metaplasia.
It is characterized by partial or complete encapsulation of the small bowel by fibrocollagenous
membrane called cocoon with local inflammatory infiltrate leading to acute or chronic small bowel obstruction.
No seminiferous tubules were identified and each biopsy consisted of dense fibrocollagenous
Microscopically, the specimen consisted of variably dense fibrocollagenous
tissue with numerous islands of odontogenic epithelium that exhibited central cystic changes.
Cutaneous lesions may be evident in approximately 25% of cases, consisting of closely situated, elevated, whitish fibrocollagenous
infiltrations, a predisposition to keloid formation, and skleroderma-like lesions (13).
Histopathologic examination of the mass revealed a fibrocollagenous
wall that was lined with stratified squamous epithelium.
Histologic examination of the nodules showed a targetoid appearance with a sharp demarcation from the surrounding lung tissue by a thick fibrocollagenous
By light microscopy, the pleura shows extensive fibrocollagenous
expansion with admixed tumor cells and sparse inflammatory cells, mostly small lymphocytes and plasma cells.
The subepithelial tissues contained a mild chronic inflammatory cell infiltrate and lobules of salivary gland embedded in the fibrocollagenous
In contrast to a moderately cellular proliferation of spindled fibroblast-like and stellate cells seen in SAFM, this tumor shows sparse stellate cells embedded in a fibrocollagenous
matrix with dilated or slitlike vascular channels.
Histopathologically, abundant fibrocollagenous
tissue without conspicuous capillarity contained widely separated collections of lymphocytes without follicular center cells; these aggregates displayed ramifying networks of capillaries (Figure 2, A).