Multiple Giant Pilomatricomas of the Shoulder and Upper Limbs

Rina Hikiami, MD; Natsuko Kakudo, MD, PhD; Naoki Morimoto, MD, PhD; Masakatsu Hihara, MD; Kenji Kusumoto, MD, PhD


ePlasty. 2018;18(ic20) 

In This Article


A 35-year-old Japanese man presented with large pedunculated tumor masses on his right shoulder and both upper extremities. We noted 6 tumors, which measured up to 8.0 × 7.0 cm. All 6 tumors were surgically removed. A histopathological examination revealed that all 6 tumors were pilomatricomas.

Figure 1.

Preoperative findings. (a) 8.0 × 7.0-cm tumor and 1.5 × 1.5-cm tumor on the right shoulder. (b) 8.0 × 6.0-cm tumor and 3.0 × 2.0-cm tumor on the left upper arm.

Figure 2.

Signal intensity of the tumor on the right shoulder on magnetic resonance images. On this T1-weighted image, the tumor shows iso/low signal intensity.

Figure 3.

Histological findings of the excised tumor. Hematoxylin and eosin staining shows a dermal tumor mainly composed of shadow cells. The black arrow indicates shadow cells. Original magnification ×100.

Figure 4.

Eight months postoperatively, no recurrent signs were visible at the operative site. (a) The right shoulder. (b) The left upper arm.