Intermuscular and intramuscular lipomas and hibernomas.A clinical, roentgenologic, histologic, and prognostic study of 46 cases

Abstract

A series of 9 intermuscular and 34 intramuscular lipomas, and 1 intermuscular and 2 intramuscular hibernomas is presented. One intramuscular lipoma infiltrated not only muscle but also fascia and tendon. The shoulder region and the thigh were the most common sites of the lipomas. Clinically the tumor appeared in most cases as a painless, fairly soft mass. Dysfunction of the engaged muscle was apparent in only 4 patients. A characteristic change in consistency and form was shown in 14 cases: the tumor being soft and flat when the muscle was relaxed, and becoming firm and more spherical when the muscle was contracted. Some tumors, having developed in a closed fascial space, were firm on palpation even when the muscle involved was relaxed. Radiography was performed in 36 patients with lipoma. In 31 of these the tumor was clearly visible because of its radiotranslucency. Streaks of higher density caused by muscle fiber bundles were seen within the tumor area in some cases. Angiography was performed in 14 patients with lipoma. Usually the tumor appeared poor in vessels in relation to surrounding muscle, and in no patient was increased vascularity, abnormal vessel formation, or early venous filling observed. Microangiography of 2 of the lipomas demonstrated their poor vascular supply in relation to the surrounding muscle. Angiography in 2 patients with hibernoma showed that the tumor was highly vascular with irregular vessels and early venous filling, findings usually held as contributory signs of malignancy in the diagnosis of soft tissue tumors. Microangiographic studies of these hibernomas, earlier reported, also demonstrated their high vascularity. A followup study has shown the benign course of intermuscular and intramuscular lipoma and hibernoma.

Deep‐seated, well differentiated lipomatous tumors of the chest wall and extremities

“…Intramuscular lipomas are characterized by a histologic appearance that is similar to normal subcutaneous adipose tissue, except that they are located within skeletal muscle. [7][8][9] In contrast to most cases of the lipoma-like variant of ALTs, there are no atypical stromal cells or lipoblasts. Cytogenetic studies reveal simple translocations or loss of chromosomal material involving the q14 -15 region of chromosome 12, paracentric or pericentric inversions of chromosome 12q14 -15, aberrations involving 6p21-22, or loss of material from the q12-14 or q22 region of chromosome 13.…”

Hip Pain in a 30 year old Athlete. Could it be due to Lipoma? A Case Report

“…Dysfunction of the engaged muscle due to extensive infiltration has been reported. (12,13,14) The skin and vessels overlying the mass show no changes even in the presence of a fairly large mass (15) . Hip lipoma causing extra-articular impingement because of pressure symptoms has not been published in English literature so far to the best of our knowledge.…”

A rare chest wall tumor: an infiltrating angiolipoma

“…Eğer tam rezeksiyon yapılmaz ise lokal nüks oranları yüksektir (%3-62). [7,8] Sonuç olarak, son derece nadir görülen bir histopatolojik tanı konulan olgumuzu hem göğüs duvarı tümörlerinin ayırıcı tanısı olarak akılda kalması hem de tam rezeksiyon ile başarılı ve güvenli olarak tedavi edilebilmesi açısından sunmaya değer bulduk. Ameliyat sırasında ortaya çıkabilecek yoğun kanamaya dikkat edilmeli, cerrahi güvenlik ön planda tutulmalıdır.…”