• Humans
• Male
• Myositis Ossificans/complications
• Myositis Ossificans/diagnostic imaging
• Myositis Ossificans/diagnosis
• Lidocaine/administration & dosage
• Lidocaine/therapeutic use
• Hand
• Dexamethasone/therapeutic use
• Dexamethasone/administration & dosage
• Young Adult
• Ultrasonography, Interventional
• Anesthetics, Local/administration & dosage
• Anesthetics, Local/therapeutic use

Myositis ossificans (MO) is an uncommon disorder characterized by heterotopic ossification within soft tissues. Only a few cases of intra-abdominal MO (IMO) have been described in the literature. Histology could be difficult to understand and a wrong diagnosis could lead to an improper cure.

We herein report the case of IMO in a healthy 69-year-old man. The patient presented with an abdominal mass in the left lower quadrant. A computed tomography scan showed an inhomogeneous mass with multiple calcifications. The patient underwent radical excision of the mass. Histopathological findings were compatible with MO. Five months later the patient showed a recurrence causing hemorrhagic shock due to intractable intralesional bleeding. The patients eventually died within three months since recurrence.

The case described could be classified as post-traumatic MO that developed close to the previously fractured iliac bone. The subsequent surgical procedure was ineffective and the disease rapidly recurred. The misleading intraoperative diagnosis led to improper surgical treatment with a dramatic evolution.

• Myositis ossificans
• Post-traumatic
• Diagnosis
• Surgical treatment
• Prognosis
• Case report

• Osteosarcoma
• hand
• trapezium
• tumor

• Bone Neoplasms/diagnostic imaging
• Bone Neoplasms/surgery
• Female
• Humans
• Middle Aged
• Neoplasm Recurrence, Local
• Osteosarcoma/diagnostic imaging
• Osteosarcoma/surgery
• Trapezium Bone/diagnostic imaging
• Trapezium Bone/surgery
• Trapezoid Bone

• bone health
• child
• conservative treatment
• excessive postoperative rehabilitation exercise
• myositis ossificans

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Myositis ossificans of the hand is extremely rare.

Myositis ossificans of the hand is extremely rare and tumors do not usually infiltrate adjacent structures. We present a very unusual case with a tumor infiltrating adjacent structures.

A 30-year-old female presented with a 5-week history of a painful rapidly-growing mass over the proximal phalanx of the right ring finger. The mass infiltrated the entire flexor sheath over the proximal phalanx as well as the checkrein ligament of the proximal interphalangeal joint. The common digital artery of the 3rd web space was obliterated by the tumor. The radial digital nerve of the ring finger was stretched and attenuated. Total excision was done and histology confirmed the diagnosis of myositis ossificans. No recurrence was seen at the one-year follow-up.

Myositis ossificans of the hand is extremely rare. We report our case to document the unique feature of tumor infiltration of adjacent structures. We also document that excision is curative despite the infiltrative nature of the tumor.

Our case is unique because of the infiltrative nature of tumor. There is no indication for amputation even for infiltrative tumors. We demonstrate that complete excision is curative with good regain of function even in infiltrative lesions.

• Hand
• Infiltrating tumor
• Myositis ossificans