(2016) reported a case of cutaneous leiomyosarcoma at the base of the right wing of a five-year-old Australian Parakeet (Melopsittacus undulatus).
Cutaneous leiomyosarcoma with osteoid metaplasia in a budgerigar (Melopsittacus undulatus): a case report.
The differential diagnosis of pilar leiomyoma includes smooth muscle hamartoma, dermatomyofibroma, and cutaneous leiomyosarcoma. Smooth muscle hamartoma is characterized by a haphazard arrangement of smooth muscle bundles separated by abundant dermal collagen.
Primary cutaneous leiomyosarcoma accounts for a significant proportion of superficial soft tissue sarcomas, but it is more common in deep locations, such as the retroperitoneum and abdomen.
Histologically, cutaneous leiomyosarcoma has an infiltrative growth pattern, and consists of atypical spindle tumor cells arranged in a fascicular growth pattern.
originating in a symplastic pilar leiomyoma: a rare occurrence and potential diagnostic pitfall.
Although cutaneous leiomyosarcoma is considered a relatively more benign process with minimal metastatic potential, systemic metastasis is still possible.
 In this article, we describe a case of cutaneous leiomyosarcoma of the face that metastasized to the lung.
The differential diagnosis of AFX is focused primarily on poorly differentiated variants of SCC, melanoma, cutaneous leiomyosarcoma
, and atypical fibrous histiocytoma.
There are two types of leiomyosarcomas, cutaneous leiomyosarcomas
arising from the dartos muscle or errector pilorum, and subcutaneous leiomyosarcomas arising from the muscle lining of arterioles and veins in the subcutaneous tissue.
Leiomyosarcomas are classified as 1 of 3 types according to their origin: leiomyosarcomas of the soft tissues, which are most common (21,22); cutaneous leiomyosarcomas
(23); and vascular leiomyosarcomas.