A case of intramuscular myxoma presenting as a swollen shoulder: a case report

Abstract

IntroductionIntramuscular myxoma is a rare benign mesenchymal tumor. Myxomas most commonly occur in the heart. They may occur less frequently in aponeurotic tissues, bone, genitourinary tract, subcutaneous tissue and skin.Case presentationThe case described here is a 44-year-old Turkish woman who presented with the complaint of a swelling in her right shoulder. A preoperative magnetic resonance imaging revealed a lobular contoured mass lesion in her deltoid muscle. The mass was marginally excised and pathology revealed intramuscular myxoma.ConclusionIntramuscular myxoma of the deltoid muscle is a very rare benign tumor. In the differential diagnosis, reactive lesions, myxoid nodular fasciitis and low -grade myxoid sarcomas should be kept in mind, upon which the treatment should be planned.

Rare Hypothenar Myxoma Causing Ulnar Neuropathy: Histopathology and Treatment Pearls

“… 1 , 2 Stout’s 1948 definition refers to myxoma as, “a neoplasm composed of stellate cells set in a loose mucoid stroma through which course very delicate reticulin fibers in various directions.” 3 While the histologic criteria of myxoma are well-established, the etiology remains unclear. 1 Although the majority of myxomas occur in the heart, extracardiac myxomas do occur, and may be found either subcutaneously or embedded within muscle; intramuscular myxomas are generally found in the thigh, lower leg, or gluteal region, with an incidence of approximately 0.1 per 100,000. 1 , 4 – 7 …”

“… 1 Although the majority of myxomas occur in the heart, extracardiac myxomas do occur, and may be found either subcutaneously or embedded within muscle; intramuscular myxomas are generally found in the thigh, lower leg, or gluteal region, with an incidence of approximately 0.1 per 100,000. 1 , 4 – 7 …”

“… 5 , 6 Myxomas have been reported to occur in the fingertip, phalanges, and metacarpal and palmar regions. 1 , 6 Benign myxomas of the upper limb are classified according to the tissue of origin, with subungual myxomas occurring most commonly, and intraosseous and intramuscular myxomas occurring most rarely. 4 , 8 …”

“…Magnetic resonance imaging allows for characterization of soft-tissue lesions of the hand and should be used when a myxoma is suspected to aid ascertainment of whether the mass arises from a nerve sheath or has an intramuscular course. 1 However, myxoma may be confused with other types of lesions, and other etiologies such as sarcoma, cysts, and infectious processes must not be ruled out until histopathologic information can confirm the diagnosis. 1 …”

An Interesting Case of Intramuscular Myxoma with Scapular Bone Lysis

“…In the present case, the intramuscular myxoma was in the deltoid muscle. Such localization has only been published three times [ 5 – 7 ], but never in conjunction with bone lysis. This bone lysis is in fact very rare, and some odontogenic myxomas with gnathic bone lysis have been described [ 8 ] but they presented more aggressive proliferation with cortical lysis and the worst prognostics.…”