[Cutis marmorata telangiectatica congenita: crossed limb dimelia]

Area of Science:

• Dermatology
• Pediatrics
• Medical Genetics

Background:

• Cutis marmorata telangiectatica congenita (CMTC) is a rare congenital vascular malformation.
• It typically presents as a generalized or extensive reticulated, reddish-blue vascular pattern on the skin.
• Localized forms are less common, making case reports crucial for understanding its spectrum.

Observation:

• A 22-month-old boy presented with a distinct pattern of localized CMTC.
• The affected areas were specifically the right upper limb and the left lower limb.
• No other congenital abnormalities were noted in the patient.

Findings:

• The case highlights an unusual, asymmetrical distribution of localized CMTC.
• This specific limb involvement pattern is exceedingly rare, with minimal precedent in existing literature.
• The patient's isolated presentation underscores the variable expressivity of CMTC.

Implications:

• This case expands the known clinical spectrum of CMTC distribution.
• It emphasizes the importance of detailed dermatological examination in neonates and infants.
• Further research into the genetic and developmental factors underlying rare CMTC patterns is warranted.