[Histology of the pigmented granular rankenneuroma (author's transl)]. 1979

P Altmeyer

We report on a case of a 40 years old female patient with a lentil-sized tumor of the left pinna present since early childhood. Histologic examination revealed pigmented granular "rankenneuroma". The lesion is unencapsulated but fairly well marginated in the dermis. It is composed of varying numbers of spindle-shaped or polyhedral cells arranged in intertwining and parallel bands separated by strands of collagen. The fascicles follow the preexisting nerve truncs. All layers of the dermis may be involved, but only rarely is the superficial subcutaneous tissue invaded. The fascicles of the tumor are generally constructed in a similar fashion. In the center one see argyrophile granular alterated unpigmented cells- Those elements are surrounded by mostly bipolar cells containing varying amounts of melanin. Silverstaining shows transition from spindle-shaped cells to granular degenerated elements. It is thought that the tumor most likely originates from the proliferation of the granular degenerated Schwann cells. The characteristic feature of tumor parenchyme is the association of the granular Schwann cells with cutaneous melanoblasts.

UI MeSH Term Description Entries
D009455 Neurofibroma A moderately firm, benign, encapsulated tumor resulting from proliferation of SCHWANN CELLS and FIBROBLASTS that includes portions of nerve fibers. The tumors usually develop along peripheral or cranial nerves and are a central feature of NEUROFIBROMATOSIS 1, where they may occur intracranially or involve spinal roots. Pathologic features include fusiform enlargement of the involved nerve. Microscopic examination reveals a disorganized and loose cellular pattern with elongated nuclei intermixed with fibrous strands. (From Adams et al., Principles of Neurology, 6th ed, p1016) Neurofibromas
D010858 Pigmentation Coloration or discoloration of a part by a pigment. Pigmentations
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D012878 Skin Neoplasms Tumors or cancer of the SKIN. Cancer of Skin,Skin Cancer,Cancer of the Skin,Neoplasms, Skin,Cancer, Skin,Cancers, Skin,Neoplasm, Skin,Skin Cancers,Skin Neoplasm

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