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Tumorous Abnormalities of Adipose Tissue

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Tumorous Abnormalities of Adipose Tissue POSTGRAD. MED. J. (1965), 41, 15 Postgrad Med J: first published as 10.1136/pgmj.41.471.15 on 1 January 1965. Downloaded from TUMOROUS ABNORMALITIES OF ADIPOSE TISSUE. J. SHAFAR, M.D., M.R.C.P., D.P.H. G. BEHR, M.R.C.P., F.C.Path. Consultant Physician. Consultant Pathologist. Burnley and District Group of Hospitals. THE TERM "lipopathy" is used 'by Lever (1963) as applying to a group of unrelated disorders of fatty tissue, particularly of the subcutaneous fat, whereas Williams and Glomset (1962) employ it to designate any condition of abnor- mal fat metabolism. Localised or unusual depositions of fat may be classified as lipoma- tosis to distinguish them from ordinary obesity (Cannon, 1950). Fat cells are found in the subcutaneous tissue of the entire body with the exception of the eyelids, penis, scrotum, and labia minora. Tumorous abnormalities of the adipose tissue Protected by copyright. may occur in the following forms: Lipomas and liposarcomas; Lipogranulomatosis; Multiple diffuse lipomatosis; rIlU . 1. Gardner's syndrome; Systemic multicentric lipoblastosis; Their number may range in the hundreds. A Hibernoma. hereditary incidence is not infrequent, with a Lipomas form the commonest soft-tissue dominant mode of transmission. It shows a tumours of the extremities, being especially male preponderance, and the age of onset varies frequent in the region of the shoulder and considerably, so that the first appearance of upper thigh, although they are observed in a lipoma may precede puberty or be delayed almost any part of the body. 12% of the until after the age of forty. A symmetrical tumours are multiple (2-6) (Bick, 1936). distribution occurs so frequently that it is http://pmj.bmj.com/ Liposarcoma in contrast is rare, and only in described by some as "diffuse symmetrical very few instances has it been reported to arise lipomatosis" (Gray and Jones, 1957). Occasion- in a pre-existing lipoma. Recurrent lipomas ally the tumours are distributed in linear are often liposarcomas from the beginning fashion along the course of peripheral nerves. (Stout, 1944). Mixed mesodermal growths with Pain and tenderness are uncommon features a fat-tissue component are classified as but are present in a minority while the tumour mesenchymomas, representing developmental is when it reaches its growing, disappearing on September 29, 2021 by guest. disorders rather than true lipoblastic tumours full size. Fresh tumours make their appearance (Tedeschi and Lyon, 1957). relatively suddenly and usually attain the Lipogranulomatosis is an inclusive term in- maximal size in a short time. On chemical dicating the presence of fat in a granulomatous analysis the tumours consist of normal fat, reaction following local injury, injection of identical in composition with that of the sub- medicaments, ischaemia or inflammation. In cutaneous fatty tissue. Serum total and free the acute phase the features of inflammation cholesterol, lipids and phospholipids are normal may be evident, but later a nodular mass per- (Shanks, Paranchych and Tuba, 1957). The sists, showing attachment to the skin and a general health remains unaffected and the predisposition to calcification (Coventry, 1954). tumours cause no concern except for cosmetic In the condition of multiple diffuse lipo- reasons or because of an unfortunate location matosis numerous lipomas are present not resulting in mechanical interference with normal only on the extremities but also on the trunk. function. Confusion with neurofibromatosis is 16 POSTGRADUATE MEDICAL JOURNAL January, 1965 Postgrad Med J: first published as 10.1136/pgmj.41.471.15 on 1 January 1965. Downloaded from a common diagnostic error. This was the and disorderly manner involving subcutaneous diagnosis offered in the example illustrated tissue, internal cavities, bones and internal here (Fig. 1) by a consultant physician and a organs. The rate of progress is slow, but consultant surgeon who had examined the characteristically excision is followed by local patient on separate occasions. The history in recurrence. Within the growth mature fat cells this instance had so far extended over 15 years, predominate; although the frequency of tran- fresh tumours arising at varied intervals. While sitional forms indicates an origin from no specific symptoms arose as a consequence undifferentiated mesenchymal cells, this origin of the lesions, the patient had developed con- is similar to the development of fat tissue siderable anxiety concerning their possible under normal conditions, and Tedeschi suggests malignant character. One of the swellings was that systemic multicentric lipoblastosis is a therefore removed and examination revealed hyperplastic rather than a neoplastic process. a simple lipoma. Systemic multicentric lipoblastosis contrasts An association of multiple subcutaneous with the benign nature of multiple subcutaneous lipomas with enormous fat pads over the rectus lipomas. The case reported by Tedeschi (1946) muscle and under the chin is recorded by illustrates the gravity of the condition. An Gray and Jones (1959). Kurweg and Spencer apparently simple lipoma appeared in the (1951) considered that the simultaneous pre- popliteal space of this patient, and only after sence of other conditions, such as palmar and the passage of 6 years was there evidence of plantar tylosis and multiple telangiectasia is multicentric proliferation of fat tissue. A fatal probably coincidental. issue ensued after the lapse of a further 6 years. In contrast is the condition of Gardner's A singular peculiarity of the case was an syndrome (Gardner and Richards, 1953): epidural location of one fatty mass, resulting hereditary polyposis of the rectum and colon in paraplegia. Relief of the paralysis succeededProtected by copyright. associated with abnormal growths elsewhere its removal, but it recurred twice, and death in the body-in the skeletal system, particularly rapidly followed the third laminectomy. in the skull, and in the soft tissues, especially Fat exists in the embryo in two forms: the subcutaneous, mesenteric and retroperito- white and brown. White adipose tissue has a neal regions. The variety of tumours is universal distribution, but the occurrence of remarkable and includes lipoma, fibroma, brown fat is limited to the interscapular, cer- lipofibroma, fibrosarcoma, leiomyoma, epider- vical, axillary and perirenal areas. Probably mal cyst and bony exostosis. An interesting brown fat is limited to the interscapular, cer- report is presented by Laberge, Sauer and cell. In post-natal life no further formation Mayo (1957). The patient was originally treated occurs and in the early post-natal phase trans- for subacute bacterial endocarditis when a formation of the multilocular brown fat cell subcutaneous lipoma was noted in the left to the unilocular normal fat cell takes place. lumbar region. 4 years later he was success- Adult brown fat these in displays differences http://pmj.bmj.com/ fully operated for multiple polyposis and distribution and gross and microscopic appear- carcinoma of the colon. At that time another ance. It also differs in its chemical constitution lipoma was observed on the anterior abdominal and its response to various physiological con- wall. Two further lipomas had appeared when ditions, but no specific function has been the patient was seen again 3 years later. After attributed to this specialised tissue (Novy and a further two years an operation was performed Wilson, 1956). Hibernating animals show pro: for a tumour of the mesentery which was minent collections of to brown fat, but the found consist of connective tissue with important role in hibernation formerly ascribed on September 29, 2021 by guest. areas of fat necrosis. to brown fat is now discredited. The rare From a review of the literature Laberge and benign tumour of brown fat received the desig- others (1957) conclude that the association of nation of hibernoma because of its similarity to colonic pclyposis with other tumours is not the hibernating gland of animals. It presents fortuitous, and suggest that when multiple clinically as a freely movable, firm, non- tumours are present, the possibility of polyposis tender swelling, and, as would be anticipated of the colon should be entertained. from the normal sites of brown fat, it occurs Systemic multicentric lipoblastosis constitutes most frequently in the inter-scapular, cervical a distinct entity to be differentiated from and axillary regions. It displays considerable multiple lipomatosis. The subject has been vascularity in contrast to the ordinary lipoma, analysed by Tedeschi,(1946). Non-encapsulated and this is a useful guide to the clinical dia- fat-tissue growths appear in an unpredictable gnosis. The tumour is encapsulated and of January, 1965 SHAFAR and BEHR: Tumorous Abnormalities of Adipose Tissue 17 Postgrad Med J: first published as 10.1136/pgmj.41.471.15 on 1 January 1965. 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J., and RICHARDS, R. C. (1953): Study while rare, has been described. of Multiple Cutaneous and Subcutaneous Lesions We have seen 2 cases of hibernoma. The Occurring Simultaneously with Hereditary Poly- first one, over the in a man posis and Osteomatosis, Amer.
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