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Case Reports
, 12 (3), 351-4

Subdeltoid Lipoma Causing Shoulder Impingement Syndrome - A Case Report

[Article in English, Portuguese]
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Case Reports

Subdeltoid Lipoma Causing Shoulder Impingement Syndrome - A Case Report

[Article in English, Portuguese]
Mario Lenza et al. Einstein (Sao Paulo).

Abstract

The impingement syndrome is defined by the compression of the rotator cuff tendons against the coracoacromial arch. Several factors contribute to this condition and they are classified as structural or functional factors. The former are changes in the coracoacromial arch, proximal humerus, bursa and rotator cuff, and the latter are related to the mechanism of the upper limb by means of synchronized activity and balanced between the rotator cuff and scapular girdle muscles. The authors report here a case of parosteal lipoma of the proximal humerus, located between the muscles deltoid, teres minor and infraspinatus causing clinical signs of impingement. It is a rare occurrence, characterized as a structural cause for the onset of this symptom.

Figures

Figure 1
Figure 1. . (A) Sagittal view showing subdeltoid lipoma not invading the subacromial space and tapering of the supraspinatus tendon (arrow). (B) Axial view showing the lipoma between the teres minor (narrow arrow) and deltoid (wide arrow) muscles
Figure 2
Figure 2. . (A) Intraoperative image demonstrating that the lipoma (narrow arrow) does not invade the subacromial space (wide arrow). (B) Lipoma adhering to the humerus, anteriorly to teres minor tendon (narrow arrow) and infraspinatus (wide arrow) muscles
Figure 3
Figure 3. . (A) Image of the surgical specimen. (B) Photomicrograph of the histological section of the lipoma (hematoxylin and eosin, 200x)
Figura 1
Figura 1. (A) Corte sagital mostra lipoma subdeltoide, que não invade o espaço subacromial, e redução do tendão do supraespinhoso (seta). (B) Lipoma entre os músculos redondo menor (seta estreita) e deltoide (seta larga)
Figura 2
Figura 2. (A) Imagem intraoperatória mostra que o lipoma (seta estreita) não invade o espaço subacromial (seta larga). (B) Lipoma aderindo ao úmero, anteriormente ao tendão dos músculos redondo menor (seta estreita) e infraespinhoso (seta larga)
Figura 3
Figura 3. (A) Imagem do espécime cirúrgico. (B) Fotomicrografia do corte histológico do lipoma (hematoxilina e eosina, 200x)

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