In an eleven part series published in Pathologica, we have presented various tumoral, quasitumoral and pseudotumoral lesions of the superficial and somatic soft tissue (ST), which emerged as new entities or as variants of established entities during the last quarter of a century. Detailed clinicomorphological and differential diagnostic features of approximately sixty entities were chosen on the basis of their clinical significance and morphologic distinctiveness. The series included fibrous and myofibroblastic
tumors (e.g.
solitary fibrous tumor, high grade classic and
pigmented dermatofibrosarcoma protuberans, inflammatory myofibroblastic
tumor and myofibrosarcomas), fibromyxoid and fibrohistiocytic
neoplasms (e.g., Evans'
tumor, phosphaturic mesenchymal
tumor, inflammatory myxohyaline
tumor), special adipocytic/vascular/and smooth muscle lesions (e.g., chondroid
lipoma, Dabska's
tumor, ST
hemangioblastoma, lipoleiomyosarcoma), epithelioid mesenchymal
malignancies of diverse lineages (e.g., epithelioid
liposarcoma, proximal-type
epithelioid sarcoma, neuroendocrine extraskeletal chondromyxoid
sarcoma), ST
Ewing's tumor and
peripheral nerve sheath tumors (
perineuriomas and pigmented and rosetting
tumors of the
schwannoma/
neurofibroma group), extranodal dendritic or histiocytic proliferative processes (
follicular dendritic cell sarcoma,
Rosai-Dorfman disease,
Castleman's disease, and plexiform xanthomatous
tumor), and
tumors with myoepithelial differentiation. The section devoted to selected pseudotumoral entities considered representatives of the
hamartoma group (neural fibrolipomatous
hamartoma, ectopic hamartomatous
thymoma,
rudimentary meningocele),
metabolic diseases (
amyloid tumor,
nephrogenic fibrosing dermopathy, tophaceous
pseudogout, pseudoinfiltrative parathyromatosis), stromal tissue reactions to
trauma (fibroosseous pseudotumors of digits) and
infections (
bacillary angiomatosis), and normal organs (glomus coccygeum). To conclude the descriptive phase, supplementary material has now been collected and appended in an attempt to provide a quick digest of essential knowledge both for comparison and differential diagnosis. The data have been tailored to synthesize diverse sources, integrating clinical elements and references to articles that previously appeared in Part I ("Introduction"), Part II ("The List and Review of New Entities") and Parts III to XI ("Excerpta"). At the very least we hope this final part ("Appendix") will provide the reader with a useful tabular organization of ST lesions and a reference resource.