Undifferentiated Pleomorphic Sarcoma of the Small Intestine with Distant Endobronchial Metastasis Presenting as Intussusception: A Case Report

Undifferentiated pleomorphic sarcoma (UPS) is a high-grade soft tissue sarcoma that arises from mesenchymal tissue. Primary UPS of the small intestine is extremely rare, and only a few cases have been reported in the literature. Its presentation is usually nonspecific; however, it may occasionally present as intussusception with intermittent abdominal pain. It is a highly aggressive tumor with a propensity for early distant metastasis to the peritoneum, lymph nodes, other abdominal organs, lungs and brain. To our knowledge, there are no reported cases of endobronchial metastasis from small intestine UPS. We report a rare case of UPS of the small intestine with endobronchial metastasis presenting as intussusception.

A Rare Case of Limited Muscle Involvement in Polyarteritis Nodosa

Polyarteritis nodosa (PAN) is a systemic vasculitis involving small- and medium-sized arteries, which presents with necrotizing inflammation. PAN occurs as a systemic disease or as a limited form confined to a single organ. Few cases have been reported with single organ involvement, and even fewer have been reported with skeletal muscle involvement. Herein, we report the ultrasonography and magnetic resonance imaging findings in a rare case of PAN with limited muscle involvement in a 66-yearold man.

Undifferentiated Pleomorphic Sarcoma of the Small Intestine with Distant Endobronchial Metastasis Presenting as Intussusception: A Case Report

Undifferentiated pleomorphic sarcoma (UPS) is a high-grade soft tissue sarcoma that arises from mesenchymal tissue. Primary UPS of the small intestine is extremely rare, and only a few cases have been reported in the literature. Its presentation is usually nonspecific; however, it may occasionally present as intussusception with intermittent abdominal pain. It is a highly aggressive tumor with a propensity for early distant metastasis to the peritoneum, lymph nodes, other abdominal organs, lungs and brain. To our knowledge, there are no reported cases of endobronchial metastasis from small intestine UPS. We report a rare case of UPS of the small intestine with endobronchial metastasis presenting as intussusception.

A Rare Case of Limited Muscle Involvement in Polyarteritis Nodosa

Polyarteritis nodosa (PAN) is a systemic vasculitis involving small- and medium-sized arteries, which presents with necrotizing inflammation. PAN occurs as a systemic disease or as a limited form confined to a single organ. Few cases have been reported with single organ involvement, and even fewer have been reported with skeletal muscle involvement. Herein, we report the ultrasonography and magnetic resonance imaging findings in a rare case of PAN with limited muscle involvement in a 66-yearold man.