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Muscular Tumour   

Pathology of Congenital

Smooth Muscle Hamartoma 

Dr Sampurna Roy MD         





Congenital smooth muscle hamartoma presents as flesh coloured or variably  pigmented plaque or macule, upto 10 cm in diameter.

Thick hairs are prominent in the affected areas.

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.


Further reading:

Congenital smooth muscle hamartoma: the importance of differentiation from melanocytic nevi.

Congenital smooth muscle hamartoma presenting as a linear atrophic plaque: case report and review of the literature.

Congenital smooth muscle hamartoma of the skin.

Congenital smooth muscle hamartoma. Clinical-histological considerations (3 cases).

Congenital smooth muscle hamartoma. Prevalence, clinical findings, and follow-up in 15 patients.

Congenital smooth muscle hamartoma. A report of six cases and a review of the literature.

Congenital smooth-muscle hamartoma.

Congenital smooth muscle hamartoma masquerading as congenital pigmented nevus.







Dr Sampurna Roy  MD

Consultant  Histopathologist (Kolkata - India)






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