The tumour is usually located in infants.

The common sites include extremities or trunks.

Histologically,  there are scattered bundles of smooth muscle fibres in the dermis orientated in various directions.
Thin retraction space is often present around muscle bundles .
Nerve bundles are also noted.
The overlying epidermis may show elongation of the rete ridges and hyperpigmentation of the basal layer.

                    Article link    ;   Clinical Image Link

Congenital smooth muscle hamartoma: the importance of differentiation from melanocytic nevi.J Craniofac Surg. 2005 Sep;16(5) :926-9.

Congenital smooth muscle hamartoma presenting as a linear atrophic plaque: case report and review of the literature.Pediatr Dermatol. 1996 May-Jun;13(3):222-5.

Congenital smooth muscle hamartoma of the skin.Pediatr Dermatol. 1993 Jun;10(2):142-5.

Congenital smooth muscle hamartoma. Clinical-histological considerations (3 cases). G Ital Dermatol Venereol. 1990;125(10):453-5.

Congenital smooth muscle hamartoma. Prevalence, clinical findings, and follow-up in 15 patients.Am J Dis Child. 1990 Jul;144(7):782-4.

Congenital smooth muscle hamartoma. A report of six cases and a review of the literature.Arch Dermatol. 1989 Jun;125(6):820-2.

Congenital smooth-muscle hamartoma.Int J Dermatol. 1987;26(7):448-52.

Congenital smooth muscle hamartoma masquerading as congenital pigmented nevus.J Dermatol Surg Oncol. 1985 Jul;11(7):714-7.

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Primary Pulmonary Leiomyosarcoma

Primary Pulmonary Rhabdomyosarcoma

Primary Monophasic Synovial Sarcoma of the Lung

Neurogenic Tumours of the Lung

Intrapulmonary Solitary Fibrous Tumour

Localized Fibrous Tumour of the Pleura

Pulmonary Malignant Fibrous Histiocytoma

Kaposi's Sarcoma and Angiosarcoma of the Lung

Epithelioid Hemangioendothelioma of the Lung

Lymphangioleiomyomatosis

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